[CR]Constrictor gear mechanism

(Example: Production Builders)

From: "John Hudson" <eggpie@gmx.net>
To: <classicrendezvous@bikelist.org>
References: <MONKEYFOODYSrxrnh3I0000269e@monkeyfood.nt.phred.org>
Date: Mon, 9 Apr 2007 13:41:04 +0100
Subject: [CR]Constrictor gear mechanism

This unusual Conloy rear mechanism just sold on UK eBay.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280099730623

The seller says "See page 169 in The Dancing Chain by Frank J Berto.(Even if you do not buy the gear buy a copy of the book, its excellent)."

As someone who doesnt own the book (although a quick check of the archives suggests I probably should), can anyone give me an idea of what it says, or maybe just tell me more about it? I was also curious about the spoke disc. Were these common in 1947?

thanks,

john hudson
london, UK