At Celebration VI, Steve Sansweet had his original Boba Fett Supertrooper Automatic Blaster on display. Thanks to Alex Alva, we had a chance to inspect it. While there are a couple of greeblies we are likely to never find, the one large found part on this gun that has plagued me has been the orange/yellow housing on the left side of the Uzi body. Well, we were able to identify some wording inside the part while looking at the gun and shortly afterwards, I was able to ID the part. It is a pen holder from a German made Rotring Sec-O-Mat set. You have to do a few slight mods to make it work, but it is actually very easy. You can see in the attached photo, I haven't shaved down the back end yet, but hopefully you can clearly see this is indeed the part!
Thanks to Alex Alva and Scott Kaufmann for helping make this happen!