Just while riding along, my shifter suddenly decided to only shift down - not up anymore. Bike-shop: "get a new one" After opening the shifter (a special bit is needed for that), it's clear that the spring at the very top is broken:
Sadly, this spring is not sold as a separate part.
Losing the snap ring at the back of the bolt that holding the spring and bending the front sheet metal a little bit to the right allowed the bold and spring to be taken out:
Bending a new spring out of 1mm spring wire with a drill, a bend nail and two blocks of wood holding the wire. The Nail should be 2mm in diameter to allow for a final inner diameter of 3mm of the spring.
Bending the spring legs in position:
Works again:
This is an ST-RS505 right side shifter, btw.
And to be fair, that's totally understandable! But still sad. The alternative are two new shifters instead of a single spring. Plus this doesn't seem to happen so infrequently as I have found out in a german forum.
Yeah in your case it’s super fiddly work, and I guess every shifter is a little bit different. But the comment on the freehub really annoyed me, from what I gathered cleaning and regreasing a freehub used to be a standard repair. And not even that hard or long. I get that a new hub is cheaper than the 15/30min rate of a bike mechanic, but saying it’s impossible is just weird.