So I ordered a used speed booster a while back from Adorama and it was missing a screw that I did not notice before the 30 day return period. Now I am noticing the element inside is rotating on its own from time to time. Adorama says tough luck and Metabones was supposed to send a replacement screw but I have been waiting over 2 months and received nothing. Has anyone replaced this screw or know what size it is? It's the speed booster ultra EF to MFT for reference.
