Rack Screws

Why are rack screws different sizes - I have just had a fight with an M6 and I cut my finger and I am not happy.

I might just gaffer the amps into the flightcases and blame the truck driver when they fall out.

I think I will be on studio spares website in a few minutes as "I canney take it anymore captain, the dilithium rack screws are interfering with the antimatter amplifiers. We will have to eject the compressors!"