As Dr. Phillip has already explained, graphite cooling pads are electrically conductive, so not optimally suited for this application.
If you mean the distance between the outer circumference diameter of the heatsink plate and the head body, there is only a gap of 0.2 - 0.3 mm in the production version of it.
Ok, so I’m going to buy some thermal paste (maybe like the MX4). I see a lot of area to cover and some looks heavily applied in the pictures. How much do I actually need. Will a 4gram tube be enough? An 8gram tube? And whatever paste I get should not be electrically conductive (even minimally) correct? Please excuse my inexperience in this type of thing.
Do you mean a technical drawing with full dimensions? Or what kind of measurements?
You will need only a tiny bit of it, approx less then 0.5g per heatsink. With a 4g tube I was able to mount three cpu coolers and four times a MF01 Mini heatsink plate.
Yes, it must be a non-electrically conductive type, but most types of thermal paste are not electrically conductive anyway.
2nd batch is full now, but I will continue to collect interests (post #2) for the case somebody jumps off or the supplier will be able to deliver a few more.