just done this modification to the Automatix hub,freewheel version so v slight difference on internals to the mcgraw images but it worked really well. Test ride completed, changes at a perfect point for me,almost getting too late, but great for inclines. It was pretty easy to do but a handy hint, look at how the spring is fitted before you take it out and bend it. i didn't and had to figure out how it worked.All good though and i recommend it.
just done this modification to the Automatix hub,freewheel version so v slight difference on internals to the mcgraw images but it worked really well. Test ride completed, changes at a perfect point for me,almost getting too late, but great for inclines. It was pretty easy to do but a handy hint, look at how the spring is fitted before you take it out and bend it. i didn't and had to figure out how it worked.All good though and i recommend it.