Andrew
The boat type holder would be a 4 way holder, and not a QCTP, would it not, so I assumed (dangerous, I know) that Graham is referring to the latter, the Dickson type.
I believe the Myford QCTP is a different one for the 7 and 10, as original equipment. Certainly 'new' Myford list the current QCTP as fitting the 7/S7 and 254, but NOT the ML10.
Whilst they are physically interchangeable, I am not sure they are the same height, and thus cause the problems you mention.
The rear toolpost is different from the 7/S7 amd ML10 too.
Edited By David Standing 1 on 20/04/2017 00:45:00
Edited By David Standing 1 on 20/04/2017 00:45:31