THE RALEIGH TWENTY

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Bottom Bracket Shell Modification

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Still clamped in the tubing block, the frame is now held in a bench vise for re-tapping. Here the taps are just started. Photo and caption by Alex Meade: http://www.alexmeade.com/
Posted by lverhagen on September 17, 2011 Full Size|

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3 Comments

Reply edwardg_smith
5:54 AM on December 13, 2014 
One thing I don't understand is how you go over existing threads with a new spec tap? Surely you don't get a solid (24TPI), good thread if you go over an old thread (26TPI). How does re-tapping to different specs work? I notice he didn't strip the old threads, then re-tap. Thanks in advance.
Reply lverhagen
9:39 PM on September 18, 2011 
wooden shoe biker says...
Do they wind tight in the same direction as the original cups ? I assume so. i.e. left side standard and right side clockwise to screw in ? thanks.


Yes, the new threading is in the same direction on each respective side as the original.

Cheers,
Luke Verhagen
Reply wooden shoe biker
6:55 PM on September 18, 2011 
Do they wind tight in the same direction as the original cups ? I assume so. i.e. left side standard and right side clockwise to screw in ? thanks.