All - 

I managed to lose one of the set screws from the DEC worm cover.

I found a suitable replacement at Harbor Freight in their Storehouse Set Screw Assortment (1/8" - 40 x 3/16").

https://www.harborfreight.com/150-piece-set-screw-assortment-67671.html

Hope this is helpful to someone at some point.

-Steve