Rob,
When I first fitted mine I was uber carefull with the drilling and it bound some. So I ran the drill through again shall we say as if I'd had a few beers
and it was nearly all gone. I then ran the car like that at a York club meeting and now they are perfect with no play at all.
Note, I just tighten them down till the head touches the wishbone, rather than crank them down like on a normal screw. I also didn't bother threading the hubs with the hex screw supplied so the threads had maximum purchase on the hub (does this make sense?).
I recomend you do what I did as now I'm VERY pleased with them indeed, I didn't break any wishbones on that club night at York either, but I wasn't exactly trying though
Dan