pretty much appreciated. thank you!
so lucky that i just got a set of new piston, nice price, exactly identical to my jp-r03, i am thinking to use the original r5 or to replace to run in with a new r7 instead.

btw, the new pt piston set with underhead, r7 is very good price, only US$250. i almost wanted to use this one for my 99% new jp-r03 housing.
and the price for the piston set of the kangeroo is very nice as well.