Durrr! I should have thought of that! It was pop riveted on the old engine block I got it from. I thought of riveting it to the air baffle plate which is sandwiched between the engine block and the mower deck. I was just trying to avoid modifying the engine block.
I imagine I'll have to drill a couple of holes anyhow. Pop rivet won't let go for sure!
I'm hoping it will solve the starting/running problem. I don't want to junk it. It's been a good mower until now. Best I've ever owned.
Thanks for your help Max.
Cheers,
James.