If you're having trouble with your tow ball, this tow ball spanner by SCA will help you both fit and remove tow balls quickly and easily. It fits 50mm tow balls with 32.5mm nuts, and the end slot also functions to tighten and loosen D shackles.
Suits 50mm tow balls with 32.5mm nut
Quickly & easily fit & remove tow balls
End slot can be used to tighten or loosen 'D' shackles