b/b cup
before trying all the differant methods, , have you tried warming up bottom bracket shell first, using either a hot air gun or a gas burner, this will have the effect of breaking the seal between casing and the cup, also a few squirts of WD40 help.
you may have to do it a few times
the ultimate tool to make, is a length of screwed rod that fits inside the hole in the cup, and is approx 4 inches longer then the width of the bottom bracket. you need 4 nuts to fit the screwed rod.
fit 2 nuts to one end of the screwed rod and weld both nuts to the screwed rod.
fit the third nut and screw down approx 2 inches onto the screwed rod and weld onto the rod.
to remove a tight cup form either side of the bottom bracket, fit the screwed rod from the inside of the cup fit the 4th nut with a washer and tighten,
on the fixed cup, which is left hand thread, this will undo the cup.
to remove the adjustable cup, tighten the nut against the cup and use the 2 welded nut to undo it.
have had my tool for over 30 years and its still as good as the day it was made and has removed tens of b/bracket cups.
before trying all the differant methods, , have you tried warming up bottom bracket shell first, using either a hot air gun or a gas burner, this will have the effect of breaking the seal between casing and the cup, also a few squirts of WD40 help.
you may have to do it a few times
the ultimate tool to make, is a length of screwed rod that fits inside the hole in the cup, and is approx 4 inches longer then the width of the bottom bracket. you need 4 nuts to fit the screwed rod.
fit 2 nuts to one end of the screwed rod and weld both nuts to the screwed rod.
fit the third nut and screw down approx 2 inches onto the screwed rod and weld onto the rod.
to remove a tight cup form either side of the bottom bracket, fit the screwed rod from the inside of the cup fit the 4th nut with a washer and tighten,
on the fixed cup, which is left hand thread, this will undo the cup.
to remove the adjustable cup, tighten the nut against the cup and use the 2 welded nut to undo it.
have had my tool for over 30 years and its still as good as the day it was made and has removed tens of b/bracket cups.