Realized that the bar end mount for the Silver shifter on the Hillborne wasn't working for me. Mechanically it was fine, just have grown out of the habit of bar-ends. Plus, I wanted to try different grips (Ergon) that would be a pain to modify for the shifter.
So, after some searching through the parts bin found a SunRace (SR) thumb shifter. Well, it uses a post similar to the bar end and looked close to the one Rivendell used to sell. So I tried it. It works! With one huge caveat. The post that comes stock on the SunRace is just a touch shorter than the post used on the bar end Rivendell sells (or the Shimano equivalent). This is important as without the slightly longer post you can't torque the shifter down enough to get the lower part to not wiggle. It's just a slight wiggle, but it's there. (This is the 16 position part that the Rivendell website mentions.)
Maybe everyone knew this and it's been discussed to death, but if you want to mount a Silver to a thumb mount, this might be the cheapest way right now.
Now, this was just done this morning and I won't get out until this afternoon for a ride, so if it doesn't work, will report back later.
Eric Platt
St. Paul, MN