As it happens, I was working on a few M05 option parts that came in yesterday, (just doing primary assembly for those particular parts, I have to wait till Monday to pick up the M05 kit), and will post pics of the finished M05, when it gets done, in the "revisiting the "M" class" thread. Otherwise, I just got done CS'ing my Losi JRXS-R this AM! It worked! It's a low ratio - about 1.33 - 1.34 or so, but in conjunction with the different rear tires, it should do well. I'll test it tonight, in my garage. The great thing is, I only swapped out one pulley - the one on the rear locked diff, but was able to use the stock belt. I just had to use a couple of 630 bearings (that was in the order that came yesterday) and make a tensioner, but it all came together surprisingly easily! No extra work was needed. I'm pretty pleased.