Please help - Mabel's leg has come off!

I was just rotating Mabel's bass drum spur back, prior to putting her in her carry case, when it came off in my hand. I've retrieved the spring and washer, but I'm dashed if I can fit the damn thing back on: it's as if the screw/bolt thing isn't long enough to thread in properly. There must be a way to get it back on, surely - but it's defeated me and Mr Madge.

Mabel is a Pearl Vision, if that's relevant.

Thanks in advance!

Please help - Mabel's leg has come off!