Clamping hexes would be nice, but I don't know of any that fit. Most metric cars (all I've seen) use a 5mm axle with a drive pin of 2mm diam. and10mm length. Schu's use a drive pin 1.5mm diam. and 11.8mm long. If only you could open up the hole in the axle to 2.05mm but the shaft is hardened so it's damn near impossible. But schumacher make thier own purpolinium hexes that are secured with O-rings. Part No. U2401A.