Sorry to be so vague, it's really a simple process if you have the correct equipment. There is a YouTube video of a guy explaining how it's done. Fiatnutz is the creator and the title is piston pin bore enlargement 17mm to 18mm. As for price I'm finding that this job costs $15-$25 a piston. Allen looks like there is two options, c clips or floating and I was considering floating to be the better route. Thank you for your responses. It's been a nightmare trying to get my samurai back on the road after a friend dropped a washer down the intake completely destroying cylinder number 4 pistons.