Anyone who has ever tried to change the rear wheel of a BMW with a single sided swing arm will have found it unbelievably irritating that the wheel can only be adjusted on the hub (to find the first thread) with difficulty, and you have to bear the weight of the wheel the whole time. With the help of this mounting aid (centring pin) it is now very easy: simply screw the aluminium pin into one of the threaded holes in the final drive hub and slip the wheel on. Its childs play, and the wheel can be secured with the remaining wheel bolts. Then simply remove the tool using an Allen key (on-board tool kit) and attach the remaining bolt.
A practical, small aid that belongs in any BMW tool box or any on-board tool kit. Machined of solid aluminium and anodised blue.