Re: [CR] swiss bb tap help!

(Example: Framebuilding)

Date: Wed, 28 Oct 2009 10:58:04 -0500
From: "John Thompson" <johndthompson@gmail.com>
Organization: The Crimson Permanent Assurance
To: Charles Andrews <chasds@mindspring.com>
References: <D39D8F1BF4A84B15B96766D4B56BC7FB@DELL>
In-Reply-To:
Cc: classicrendezvous@bikelist.org
Subject: Re: [CR] swiss bb tap help!


On 10/27/2009 10:17 AM, Charles Andrews wrote:
> So, in the ongoing saga of this Mondia Special frame I bought in a
> moment of madness..I did find a swiss bb fixed cup (thanks Richard!)
>
> But, now, after much elbow-grease (basically, re-tapping the worn
> threads with the cup), I simply cannot get the cup to go on the last
> two mm or so. I've been using the usual campagnolo cup-wrench, not
> the big shop-tool version. I know that wrench is pretty much useless
> for anything more that a snug cup, but I have managed to use it to
> get the cup in almost tight.
>
> What I really need is to find someone--or a shop--that still has
> swiss taps. Any suggestions?? Anyone know of a shop or person who
> would have a swiss tap so I can do this job right? I really don't
> want to break out my VAR-copy cup tool and force the thing in,
> although I will if I can't find someone with the right tap.

If you have a Dremel, you can make a thread chaser out of a fixed cup by grinding a couple slots across the threads to catch the debris:

http://os2.dhs.org/~john/thread-chaser.jpg

Given that Swiss cups are fairly rare, you could still use the cup after this modification.

--

-John Thompson (john@os2.dhs.org)
Appleton WI USA