Thanks Alan - but it's not what I'm looking for. I've no idea what it is!
Thanks Adam, I'd appreciate the measurements from your saw. I'm fitting it to a TA175 so expect to have to do some fettling, but I'm happy I'll be able to fabricate mounting brackets and get the support arm in the right place.. Unfortunately, the rollers aren't in the same plane so it's difficult to get really accurate measurements. I find a 68mm plastic drainpipe can be forced in with some slight deformation so I'm thinking 65mm or 2.5 inches would be about right, which corresponds to the measurements I've taken; but I would appreciate confirmation before I order some metal!
Thanks,
Dave.