The likely cure for this iw what's called a "bottoming" tap; one that's
ground off square on the end as you need to clean out threads all the way to
the downtube wall. The size is 5mm x .8mm.
Use lots of oil, the broken end of a tap is a bear to get back out!
DF
----------
>From: "Jon Bridges" <jon@icetv.co.nz>
>To: <classicrendezvous@bikelist.org>
>Subject: [CR]Shifter Bolt won't screw in!
>Date: Sat, Dec 16, 2000, 4:02 AM
>
>On the Campy downtube braze-on shifters, the little bolt that screws into
>the braze-on on the right hand side, won't screw in all the way. It is
>about 4mms shy I reckon of where it should be. I've tried CRC in the hole,
>and scratching down the hole with a paper clip and safety pin (to try and
>clear the thread), but I can't seem to get it to go any further. Any ideas?
>
>Jon Bridges, Auckland, NZ. (66F @ 1am)