When I renovated my R20 I opted to keep the original SA 3 speed hub. I bought a replica SA three speed trigger shifter for it.
For the last 2-3 months it shifted fine but in the last week it has slipped gears more than three times.
I usually keep it at the 2nd gear and seldom use the 3rd and never had the need to go to the 1st gear.
I'm puzzled then as to why it's suddenly slipping. Any thoughts on this?
What can I do to get it back to the smooth shifting it did before?