well, I finally got my Tamiya slipper for the Keen Hawk and it took all of 5 seconds to fit a b4 spur on there. It literally took a couple of very light turns of my reamer to bore out the centre very slightly - of course it then had a slight cone shape on the hole - but when its clamped between the pads there is no problem at all. perfect.
I went for the 81 tooth b4 spur which is bigger than the 82 tooth Tamiya slipper item. There is a little rubbing on the gear cover so I used a dremel with a sanding drum to just take off a fine layer of the inside edge of the cover - again, perfect.
The smaller 78t b4 spur would be a better / easier fit, but I need as big a spur as possible for the brushless gearing.
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