I can't quite get the action as low as I would like on my new Franken P (http://www.talkbass.com/forum/f8/now-bass-looks-home-surf-band-894897/). The E saddle is all the way down on the bridge plate and I'm still about 1/64" away from perfect action (for me). I'd like to get the saddles up into a more normal position at the bridge as well. Nothing too drastic, but a shim seems in order. What do you guys use for neck shim material? Business card maybe? Other?