Yeah. What Barrie said. Dad bopped himself on the nose removing the wheel that was only pushed on! Never hit the shaft without a nut on, to protect the thread.
whoever holds the wheel should hold as near to the boss as possible, as the Bluemels wheel is quite flexible.
There is precious little room to get a puller behind the boss, and the boss is quite fragile, so I`d not recommend that approach.
Alternatively, simply unbolt the wheel from the boss. I`m sure our wheel was screwed directly into the boss, but when I fitted a new wheel, I made an adaptor plate and longer screws with nyloc nuts on, as I wasn`t happy with the threads in the boss.
Might I humbly recommend going for a slightly smaller wheel, whilst your at it?
I had a 15" Moto Lita which was quite nice, but the 16" Cobra wheel with slight dish is really, really nice! (Trouble uploading, photos to follow when possible.)