I just purchased a Gem 1912 Junior Razor and some Gem SE blades. Feather also makes a SE blade, but it doesn't appear to have a spine on the dull side of the blade. Does anyone know with certainty whether a Feather SE blade can be used in the Gem 1912 Junior? I'm asking because the Feather SE blades are not widely available and I don't want to get stuck with 30 blades that I can't use. Thanks in advance guys.