I just bought what was advertised as a 19mm master cylinder off EBay. I got it last night in the mail and I believe it is a 17mm. Thing is, there is a 17 stamped (cast) onto the neck and a smaller 19 cast onto the underside of the body. So, which is it? I need to contact the seller and let them know they sent me the wrong one. But first I want to make sure I know what I am talking about.
Also, out of curiosity, is possible to convert a 17mm to 19mm by having a machine shop bore out the inside 2mm. I know a 19mm piston would need to be procured. Just wondering.
Thanks!