I've had good luck withjust beingable to push the piston with a little force, and it should not drop down on its own. If you need to get out the hammer, thats way too much. But the important thing is that I dont start "feeling the fit" until I've got the seal past all the slots/cutouts and it is in the compression chamber. If you have a lot of seals to choose from, there's a little variance in the OD, and you can see what kind of effect the smallest and the largest has on the amount of force that is needed to push. The seals are cheap enough, especially when JM has them on special, so you can get a pretty good assortment of sizes going on. I've been following his specials for many months now, and have gathered a whole lot ofdifferent sized seals. I figure he can't make 'em forever, so why not spend the money before they are not available anymore.
