Trail Tech CHT guage

Trying to fit one of these but as the plug hole is recessed slightly the copper sensor snags on the head and won't fit properly , anyone know how to get around this problem ?
The ability to post messages is restricted to LCGB members. Any questions contact us at lcgbadmin@googlemail.com
https://www.ilambretta.co.uk/forum/
https://www.ilambretta.co.uk/forum/viewtopic.php?f=7&t=13249