This is copied/pasted from a few weeks back from the prior thread here: http://www.talkbass.com/forum/f8/rickenbacker-club-part-seven-928435/index48.html This was in response to GG7's similar questions about the Hipshot bridge. Here is everything you need to know:
1. You can get a new one on eBay for [a little over] $100.
2. Get the aluminum version. The saddles are brass on both versions anyway. No reason to add more weight to a Rick!
3. There are 2 subtly different generations. Mk1 had a flaw in the string insert placement allowing the saddles to wobble. Mk2 made the issue BETTER, by lowering the inserts/raising the break angle (see pic - mk2 is on left).
4. I find the palm-mutability and string lateral/height adjustability to be essential.
5. The only issue I had is with getting the action low. I had to have my E saddle shaved, and my G is bottomed out. Luckily with the right relief, I can still achieve nice, med-low action.
6. There is still one more problem: the lower the saddles go, the more laterally unstable they become (as you lower the saddles, they unseat from the grooves). I fixed this issue with pieces of [memory foam] jammed in between the saddles! You can't even see that I did this because I shoved em in there with a feeler guage!!
Let me know if you have any more questions/concerns!
