I photo-documented the steps of changing over to a 3 piece crank for general usage or for the shifter kit.
First is a picture of wrenched maniac aka lurch or "The Crank".
Then a pic of the dead carcass of a one-piece, or a piece de Ashtabula. Removed from a 1980's Columbia Bike. Note that it is, well, one piece - one forged piece.
Followed by the cleaning up of the bottom bracket to allow the cups to fit. Mostly raised metal, weld seam, paint and crud. Used a moto tool sanding drum. There is no way the cup could be pounded in without the clean-up, but be careful, it still needs to be a press fit. I smacked it with by dead blow hammer, a block of 2-ba-4 and hammer, and a ball peen with a brass drift.
The purchased assembly for under $20.
First is a picture of wrenched maniac aka lurch or "The Crank".
Then a pic of the dead carcass of a one-piece, or a piece de Ashtabula. Removed from a 1980's Columbia Bike. Note that it is, well, one piece - one forged piece.
Followed by the cleaning up of the bottom bracket to allow the cups to fit. Mostly raised metal, weld seam, paint and crud. Used a moto tool sanding drum. There is no way the cup could be pounded in without the clean-up, but be careful, it still needs to be a press fit. I smacked it with by dead blow hammer, a block of 2-ba-4 and hammer, and a ball peen with a brass drift.
The purchased assembly for under $20.
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