I have resealed many Schimels over the years, I did one just last week, they are very easy to do if you you know how, and like Baz said there are 2 seals that are standard, but I have to make one or the internal seals, other than that no problem, I have had a couple of mishaps due to the fragile metal that was used in the manufacture, but when working they are great pistols.
Cheers,
Lawrie.