Screw size for Bolex threaded sockets?

[woods01]

I tried googling this to no avail. What size of screw do you need for using the threaded sockets in a Bolex to mount a motor? Seems to be a very fine metric thread, I tried a couple local hardware stores with no luck.

[bolextech]

It's M3.5 x 0.6

Cheers,
Jean-Louis