I have been going through this myself!!
If you have one, a vist plate would be good. other wise, the catek polycarbonate spacers are a good way to keep from point loading. Due to diffuculty of reaching catek, I made my own. You can get the plastic from home depot (believe it or not). It's the same stuff. just make a template, cut it out, round alll the edges off (so you don't point load there either), and mark/drill holes. don't push hard when drilling plastic, it tends to shatter on the bottom if you do, just let the bit do the work. For hardware, you will need m6x18, or m6x20 depending on you're equipment (go to mcmaster.com).
I just got a 185t myself an installed these spacers on there (I of course have cateks:eek:) so the evil metal bindings are on my metal boards.
I won't go into my thoughts on that but, make the spacers, it was very easy. If you can't, contact me, I could sell you a set of mine