Just to provide a more complete response to what I said earlier- I froze my seals and I used @Brutacus' method using the hub flange to carefully drive it in. By the time the seal was installed, it was warm and pliable enough to reassemble everything.It has been freezing tonight, about 17 F in Dan's workshop. So we put the brake drum in the kitchen in front of the wood stove, the only really heated room in the workshop. It will stay there today and throughout the night. Will not do much, but it will help a bit. The seal goes into the freezer and tomorrow morning we will try to assemble it.