Trying to get my wheels off and they're not playing. Haven't been off for a while so they're stuck on tightly. This spanner is prone to slipping off the nut, and simply won't budge it at the moment. Anybody use a better design? Thanks in advance.

https://www.tm-img.com/image/zSCtq

https://www.tm-img.com/image/zSBdR


Morgan Plus 4
Royal Enfield Classic 350
Brompton M6L
Giant TCX Advanced