3030 T-slot Nut with Spring (m3 m4 m5 m6)

I needed some slot nuts for 3030 aluminium frame so I designed some. Also I needed some of them to retain their vertical position for easier installation so I added a small spring. Both versions (with or without spring) are included for M3, M4, M5 and M6.

As always, if you find it useful a tiny donation goes a long way to show appreciation. :)