Some of the guys on the German site were in the 15-20 mm range. My sticking was severe, I end up at 14-15 mm. 5 did nothing much except give me hope. It's a pretty flat curve, so I doubt a few mm one way or another makes much difference. I wonder; has anybody gone obviously way too far, and with what result? I would imagine a lot of extra play would manifest as erratic assist, or maybe a clunky response as the worm catches up to the spur. Certainly not looseness, since there is still a direct connection between the wheel and the rack.