@lox897 I found a black screw with some of my other stuff so not sure if its the correct one. I don’t see any other black screws though, is this the one?
Does this also mean that there is just a spare silver screw?
There are 2 silver screws for the motor mount and 1 screw for the motor pulley. Can you put that next to a ruler so I can see the size?
@lox897 ah i see, didn’t realize there were 2 slots in the trucks mount.
the black one looks around 3mm or so, is that the right one?
No. My one is about 8mm.
@lox897 Thanks for the help, it turns out I’m an idiot, I actually assembled that thing awhile ago, it turns out I already put the set screw in there lol.
LOL , It happens to the best of us 
What size are they . M4x8mm?