I bought a second hand 3600BR from a pawn shop a few yrs agoand it seemed to have a differnt collet to that on my 3612C
Hitachi M12V has similar "one-piece" type collet. Newer models separate the collet and the collet nut.I bought a second hand 3600BR from a pawn shop a few yrs agoand it seemed to have a differnt collet to that on my 3612C
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