Yeah it is worn down quite a bit to be able to see it in the picts. If you replace the connecting rod, it is best to replace the bearings while you are at it too. Maybe the cylinder and piston is worn down some as well. I think that Jett has different size pistons thus if the cylinder sleeve is good it may not need anything or a slightly larger piston too.

As mentioned already, Jett changes his email address from time to time due to spamming. You may have a old email address.