i've always heard auto tranny fluid for cc'ing a combustion chamber and using the flat disc. what are some of the other methods? i've never seen a thread on this and thought it might be interesting to hear.

 

I use a plexy glass plate with a chanferd hole in it and parts cleaner for the liquid because its darker than water but the same thickness. also put white grease around the chamber when you put the plexy plate on so nothing leaks out while your checking the cc's