Re: [CR]Stronglight extractor thread 23.15mm - Proprietary?

Example: Framebuilding:Norris Lockley
In-Reply-To: <>
References: <>
Date: Thu, 11 May 2006 11:52:45 -0700
To: Chris Kulczycki <>,
From: "Jan Heine" <>
Subject: Re: [CR]Stronglight extractor thread 23.15mm - Proprietary?


I had no problems finding extractors on e-bay. I wonder how much demand there is...


At 11:52 AM -0700 5/11/06, Chris Kulczycki wrote:
>I checked 8 or 10 fastner houses I've used in the past and not one
>of them has anything in 23.5mm.
>I think Porsche may have used this thread on some engine parts, but
>that's as close as I came. I
>think I could have a run of extractors made up if enough people were
>interested. I have no idea of
>the cost but I wouldn't charge any markup, other than keeping one
>for myself ;<). I doubt the
>machinist I work with would do it if there were less then 30 or 40
>orders. I'd also need someone
>to lend me one for a pattern.
>> I never have seen that thread elsewhere. The fact that TA and Herse
>> both use 23.0 mm, which is close, but not quite the same, indicates
>> that it is just something they made up.
>> A lot of the older threads are that way. When you can't find the
>> original tool, you just make your own taps. (I once made some
>> flat-bottom taps to retap the crank threads of TA and Herse cranks...
>> It adds to the challenge of restoring these old machines.)
>> Jan Heine
>> Editor/Publisher
>> Vintage Bicycle Quarterly
>> c/o Il Vecchio Bicycles
>> 140 Lakeside Ave, Ste. C
>> Seattle WA 98122