Installed the clamp today. I used M6 hardware all around.
M6x40 Socket cap (4)
M6 nuts (8)
Phillips rounded head M6x60 (4)
M6 fender washers (4)
Fender washers go on the underside of the carrier.
On thingiverse:
STL files on this thread: (at the end of the post)
I used a 15/64 drill bit to remove flashing and any left over support material from all the holes in the clamp. The 6mm socket heads will fit tight, but I like the fit. Once I got the socket head screws to slide in all the way (before they were trying to thread in) I used my impact to spin them which made the heads fit better in the recessed holes. I McGyvered the washers and nuts on the bottom using the following trick.
The rest is pretty self explanatory.
