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@hma
UG was before HG :) hyperglide is the one with the inner threads. i do not know when they started producing the new system but it goes like this:
FH6400 is the original one, UG only
FH6401 i don't know, but if i remember correctly, that's still UG only (could be wrong)
FH6402 UG/HG = good for you :)