Hi Jim
Sorry I hadn't seen your email. I was dealing with another member and he kindly provided a couple. But, I am still in the market. I can source spares as I have a trade relationship with AHG, but even they dont have whole units.
I already have a couple spare plastic covers, and even if I dont put them both into active service, I can cannibalise for spares, for example, I stripped the thread on one of my existing ones, so the cant is held by one screw, not both. . . .
Kind regards
Peter