Oh so eloquently put Spatz! You have hit the nail squarely on the head! Thanks!
In actual fact, the TT box I have was built with many changes and shipped by CMS just before they introduced re-machining the slave mount hole to accept a different std GT2 slave, so I had a problem!
How the hell was I going to mount anything but the humungously large TT assisted slave!
I was lucky in a way because I came across an adaptor on ebay, which used the original mount points but allowed it to ‘cradle’ a standard GT2 slave- on subsequent searches, I found no more…
I was informed by ‘those-who-know’ just recently that this adaptor is in fact an EVOMS aluminium bracket.
see here....

The next challenge was that the push-rod was not long enough, so I got our northern friends AB to make an adjustable extension.
That was probably 2 years ago, and my plan was to use the vacuum assist unit I picked up back in 2007.
That plan did not quite work as expected. I suspect the travel in the vacuum unit is not long enough or something, so ditched that, reconnected , bled and then found out how ridiculously heavy the clutch really was!
I have driven many cars, trucks, JCBs etc. in my long years, including 50’s and 60’s race cars, but NOTHING comes anywhere near the pressure needed to actuate the clutch!
And so, I have just purchased a .625 Master to see what effect that has. If too long a throw, I will try the .70. Next if still not happy I might try AB’s offer of a pedal mod.
…unless someone has a more cunning plan….?
Oh, and I have just cut a hole from the floor below the pedals and despite wearing goggles, managed to fill my eyes with aluminium dust when they got knocked off – silly me!
cheers