it uses 4 m3 screws. the idea is that you assemble the thing , spray a debinder inside it and then inject high temperature silicone with a silicone gun.
but you can use it manually too. but your hands will get a bit messy .
just take all the parts and grease them well (lithium grease, or a proper debinder, or floor wax) then put a lot of silicone manually everywhere taking care of not having air holes and assemble this. put the m3 screws and the nuts. thight them well.
then on the hole in the top insert a m5 bolt right to the block and leave it there until you dissasemble this. this will lower your drying time like 10 hours.
well now let it dry for 10-12 hs to be sure and dissasemble it by hitting from the bottom with a hammer and some 12mm diameter stuff you can find lying around in the central support. done.
fusion model : https://a360.co/2Qy7glL