Originally Posted by
SB_Greg
Much thanks for the wisdom. I’ll start hunting for a 4600 gs. I also just ordered one of these to contend with the Simplex dilemma.
What I see going on there is a potential for the nut that holds the hanger to interfere with the smallest cog or the chains engagement with the smallest cog.
If the original is already tapped, why not trace the profile & file it with a hand file? It's a pretty straight forward task & not even particular to degree of precision. Plus it's much harder to screw up if done by hand and allows the maximum freedom of 8 through 12 cogs of all modern cassettes.