The SA-5, SA-50 and SG-20 vibrato (tremolo) arms and collets are removed sometimes and then get lost. I had a number SA50s and one SG2 without their vibrato arm (whammy bar, tremolo, whatever) so decided to make them myself.
The SA-50 vibrato arm I make from 316 stainless steel while the collet is made from 304 stainless steel. The nuts are also 304 s/s.
If you are interested in getting one of these vibrato units, contact me.
Below the SA-50 video I made about the vibrato assembly and installation with my aftermarket vibrato arm and its collet.
To check out the video for the vibrato assembly and the SG-2 installation click here.