Sorry about reviving a zombie thread, but I just did it this weekend- got rid of the crummy 660 brake lever and put in a 700 brake lever. Required an angle grinder and a drill. Here are the steps:
1) remove the old lever assembly.
2) grind a slot about 1" down from the top of the front of the U-channel mounting post (part of the frame). This is so you can bend the side out to form a tab toward the front of the rhino. One hole will be drilled into that tab.
3) grind off the whole back part of the channel, down about 2 1/2 inches.
4) grind off the old mounting nut that was welded onto the U-channel
5) grind 1" diagonally off the corner of the rear of the u-channel
-- now there should be a flat area where the new brake handle can mount. Drill your holes and attach the cable and find a couple of bolts, and mount it. Then cut a bigger hole in the engine cover- I just enlarged the existing one front and rear.
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