For around about the same cost as the chinese QCTP's, you can get one from
A2Z.
Not sure if there's one to suit the M1, I couldn't see one listed
here but only had a quick look.
I'm sure they could find one with an email of the dimensions of the M1's toolpost.
Edit, just noticed the C1 / M1 uses a T-slot for the toolpost, the QCTP for the
Taig lathes might fit... def worth emailing them.