I used really coarse sand paper on the metal posts, then filled the rubber feet with contact cement then pushed them on. After all four were on I turned it upside down/face down on a table and put some weights on the back and let it dry for 24 hours. Can't even get them off now if you try!!
GP Bikes had the fork stem kit in stock for $50 (it was on sale). I bought it, but I already had a "custom" fork stem set up for my track timer, so I bought another diamond plate ball and just used the rest of the kit (xgrip, socket arm). I modified the socket arms so that you can do a better angle up/down if needed:
Here you can see where I modified the socket clamp arms. Where you see it in this pic it doesn't do anything, but the same modification on the bottom allows you to do a down angle like what's visible in the last pic.
I got the two USB 2.1amp ports there too for keeping my tank mounted camera and phone or GPS fully charged 24/7
When I'm not feeling so lazy I'll probably cut off the ball on the bottom of the xgrip and then put a long thin bolt through the middle of it and mount it to the fork stem rubber thing that came with the kit, then it'll be sitting flat right against my top triple tree.
