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Cable Trunnions

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Cable Trunnions

Postby rossclark » Fri Oct 09, 2020 10:57 pm

Was watching a video on YT the other day and someone was fitting cables - cut a long story short he said the little disk thing was supposed to go in below the cable. I've always put them on top as my understanding was that they were supposed to stop the screw chewing the cable.

What do others do?
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Re: Cable Trunnions

Postby Andy B.L.C. » Fri Oct 09, 2020 11:42 pm

not what they did, that's just daft & coming from someone with a smart phone & a lack of idea...
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Re: Cable Trunnions

Postby davla » Sat Oct 10, 2020 4:48 pm

On top
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Re: Cable Trunnions

Postby Warkton Tornado No.1 » Sat Oct 10, 2020 5:14 pm

Definitely fit the pad to protect what is being clamped.

'We' are not the only users of softer material pads. They are used extensively in industry to protect shafts when items are clamped via a 'grub' screw yet need to be adjustable.

Here is the first example I could find, but it proves the concept:

https://uk.misumi-ec.com/vona2/detail/1 ... s2products
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Re: Cable Trunnions

Postby Rich Oswald » Sat Oct 10, 2020 6:14 pm

Yes, I watched that too and picked up on that.
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Re: Cable Trunnions

Postby Knowledge » Sat Oct 10, 2020 6:34 pm

Mind you, I have seen trunnions drilled ‘too deep’ and therefore you need to fit a pad below as well as on top to stop the combination of the cable hole and the grub screw cutting the cable.

There are plenty of pitfalls in these tiny trunnions.
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Re: Cable Trunnions

Postby kclewis » Sat Oct 10, 2020 7:18 pm

Yes I have just watched that video too, and thought he had got that wrong!
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Re: Cable Trunnions

Postby nickw » Sat Oct 10, 2020 8:12 pm

Lol glad I wasn't the only one. I've spent the last couple of days trying to reference that in Lambretta manuals. I had just bought some trunnions where the discs are too small and they fall to below the cable. This added to my confusion of where they go, thinking I had it wrong.
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Re: Cable Trunnions

Postby Tractorman » Sat Oct 10, 2020 8:37 pm

Try using some split shot from a fishing tackle shop. They are made from a lead substitute and squash around the cable when the grubscrew is tightened.
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Re: Cable Trunnions

Postby bike grim » Sat Oct 10, 2020 11:02 pm

Tractorman wrote:Try using some split shot from a fishing tackle shop. They are made from a lead substitute and squash around the cable when the grubscrew is tightened.


The later Straightjacket type trunnion by Jamie Supereibar come with fishing type shot instead of crush pads
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Re: Cable Trunnions

Postby rossclark » Sat Oct 10, 2020 11:53 pm

OK thanks, I had begun to doubt myself.

Occasionally if I'd lost the pad I used to cut off a small section of a screw.

I also noted the straight jackets had changed to a shot ball and last time I adjusted the cables it was so deformed that it had wrapped round the cable and made it difficult to shift. I'm sure I still have some nontoxic shot in one of my old tackle boxes.
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Re: Cable Trunnions

Postby Fast n Furious » Sun Oct 11, 2020 12:36 am

I dont like the trunnion types with the 3mm grub screw.
I find that the washer tends to expand and spread under tension with these, which can jam into place making it difficult to get the old cable out. And, yer less likely to round-off a 3.5mm allen screw head!
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Re: Cable Trunnions

Postby coaster » Sun Oct 11, 2020 11:01 am

bike grim wrote:
Tractorman wrote:Try using some split shot from a fishing tackle shop. They are made from a lead substitute and squash around the cable when the grubscrew is tightened.


The later Straightjacket type trunnion by Jamie Supereibar come with fishing type shot instead of crush pads


They do and very nice trunnions they are too but if you have to change a cable at the side of the road you'll need some replacement shot as they are single use :?
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Re: Cable Trunnions

Postby Rich Oswald » Sun Oct 11, 2020 12:09 pm

Fast n Furious wrote:I dont like the trunnion types with the 3mm grub screw.
I find that the washer tends to expand and spread under tension with these, which can jam into place making it difficult to get the old cable out. And, yer less likely to round-off a 3.5mm allen screw head!


Chiselspeed are doing some similar the Straitjackets but even better and they use a 4mm grub screw. They are the only ones to buy now imo, I think they are only in black though.

Rich'
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Re: Cable Trunnions

Postby gaz_powell » Sun Oct 11, 2020 5:52 pm

/\ SIP made ones, they are spot on.

4mm Allen stud and a 10mm shoulder that sits on top of the linkage.

They are in black.... Once tried you won't back.....
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Re: Cable Trunnions

Postby gaz_powell » Sun Oct 11, 2020 5:58 pm

Won't be long before BGM have copied them....
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Re: Cable Trunnions

Postby gaz_powell » Mon Oct 12, 2020 2:57 pm

gaz_powell wrote:/\ SIP made ones, they are spot on.

4mm Allen stud and a 10mm shoulder that sits on top of the linkage.

They are in black.... Once tried you won't go back.....
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Re: Cable Trunnions

Postby Rich Oswald » Mon Oct 12, 2020 4:45 pm

gaz_powell wrote:
gaz_powell wrote:/\ SIP made ones, they are spot on.

4mm Allen stud and a 10mm shoulder that sits on top of the linkage.

They are in black.... Once tried you won't go back.....


I've got to second that Gaz, they are the very best you will get and you will never go back to the originals.

Rich'
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Re: Cable Trunnions

Postby dickie » Mon Oct 12, 2020 7:40 pm

gaz_powell wrote:Won't be long before BGM have copied them....

Or invented them ;)
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Re: Cable Trunnions

Postby Toddy » Tue Oct 13, 2020 5:53 am

dickie wrote:
gaz_powell wrote:Won't be long before BGM have copied them....

Or invented them ;)


:lol: :lol:
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