Thanks for the recognition Vego. Truth is we never really illustrated the brass shim. I'll just post briefly here, since this thread is for the Oddy clones.
The first mod I would suggest is you least favorite! The brass shim. I've been meaning to post photos of what we did on that thread, so I'll get to that over the next few days. Fortunately it is the easy mod, since you basically need a pair of scissors and a pair of good eyeballs. We just snipped a little rectangle of brass sheet and rolled it into the body of the switch, closing the gap and smoothing out the slop. So the switch is a tube, and we just made another really thin tube inside to snug it.
In the meantime you may want to try sourcing the brass sheets. Most hobby and hardware stores have a K+S Engineering display, so I'd check my local shops. Frankly, the MKB-TS (first edition) switch is really sloppy until this fix is performed. If you totally strike out, I can probably dig up the extra I had left and mail you a bit.
So when you get your new mod, come on over & we'll start answering your questions, or do whatever we can to help you get that bad boy tuned up.