Yes, the Motovation sliders required drilling. If you look at the bottom of the wishbone frame piece you will notice a piece of round stock. It has a .030 hole in it and you have to drill it to .040 (10mm). I was leary of it at first, but when looking at how solid everything was, I decided it really wasn't a big deal.
Fortunately, I can't tell you how they work

but as I mentioned in another post somewhere, the other point of contact was the rear peg. Specifically, the Aluminum pieces that hold the peg, and they probably won't survive another slide. I would really like to get some kind of slider in there somewhere, but I will have to get a mount welded somewhere.
Later, Guy