VaughnT,
Here is the answer I got from Les Bengston when Brownells backordered the "Vice Grip" tool and I was looking for an alternative technique for attaching the plunger tube:
There are several ways of doing this job besides Kuhnhausen's (vice grip tool) method. You can epoxy the plunger tube on (works especially well with aluminum frame pistols), you can soft solder it on (or use low temp silver solder), you can use high temp silver solder to solder it on, or you can stake it in place using either a bent punch or a specially modified pair of common pliers. With either staking or the use of epoxy, you should open up the hole in the frame slightly with a Dremel tool/die grinder and a circular bit, creating a small crater on the inside of the magazine well. This gives something for the legs of the plunger tube housing to be staked into. Otherwise, you are merely trying to expand the legs slightly to a tighter fit in the holes in the frame. That is the normal factory practice and is why they sometimes come loose. When using epoxy, you epoxy the plunger tube housing to the frame and put a little extra epoxy into the small craters. Then, when! everything is hardened, use 120 grit emery cloth wrapped around a file to dress the area level. I do not know how long the epoxy will last as I have never had it break on a gun I fixed in that manner. Everything needs to be very clean when using epoxy or solder. Solder will last for ever, but will damage the bluing, which must be removed for the solder to join the pieces properly.