For my ASC auction I will swap out free of charge the 12-spline driver for a more modern 3-spline driver which will take modern and easily available sprockets. And I can supply the necessary driver for anyone with easy to follow instructions who wishes to replace a 12-spline driver in an ASC, AM, AF, AC, FM or FC with a 3-spline one. However the the 12-spline sprockets are better made than the 3-spline ones and are rounder so more satisfactory in a fixed gear system. I used a 4-speed SA control with an ASC (using positions 1, 2 & 4) very satisfactorily on a daily basis throughout the 1980s - instructions are on the web for converting a 4-speed trigger to the ASC type - this gives you a faithful copy of the ASC trigger as regarding cable pull.
Hilary Stone, Bristol, England
Doug Smith wrote:
> SA. ASC. on ebay:-
> Just a thought for any prospective buyer/bidders proposed purchase.
> I would pose the question regarding the future replacement of the 12
> small notched sprockets and lock nuts of the ASC hub. I understand
> they are quite rare to obtain if at all! Perhaps a couple of spares, if
> available, from the seller would a good idea. In my experience this
> model does need the correct 3 speed changing gear control to work
> Doug Smith
> North Dorset