Casa piston C clip tool

Hi, I recently bought a kit from Rimini and thought I'd buy one of the clip fitting tools as my eye's and fingers are not like that of a younger man
Not sure of which size to get I ordered the 15mm sized tool forgetting the piston pin is 16mm. My question is will the tool I bought deliver the clip into the piston as it should or somehow distort/weaken the clip?
sorry for the long winded post.
Dave.

Not sure of which size to get I ordered the 15mm sized tool forgetting the piston pin is 16mm. My question is will the tool I bought deliver the clip into the piston as it should or somehow distort/weaken the clip?
sorry for the long winded post.
Dave.