[GB SISSON]

I'm goin' in.... I found a bunch more written about teflon and aluminum buttons. I see their use in aircraft engines and caterpillar diesels from the factory, and as I mentioned they are very prevalent in hot vws and motorcycles, air-cooled stuff, talking about expansion and contraction. There are some arguments pertaining to their use, ( not as heated as the thermostat wars here) but with a set of pistons at 425.00 and then having to re-use the rings or new. The pistons I have seem lightweight and are unmarked and not sure where I could buy 3 more, so that's why I'm even doing this. With the research I have done I have firmed up what has already been expressed here. I have sized the stems to be a press fit into the wrist pins and the heads are now exactly the same dia as the wrist pins so they will rotate with the pin whenever it chooses to. After pressing in the buttons I trimmed any oversize off with a fresh razor knife blade, resting the blade on the pin, and rotating it around. So far this exercise has cost me $38.45 and a little sleep at night.... Thanks for all your input. They will be going in the holes after work today.