Ending this post- Done, finito, Happy camper! After the new nylon cam went in, it still did not work.
30 hours later - I pulled out most of the springs, pushrods, gears, and even more the Nylon push-rod parts. Yep- Even more plastic parts in the bowels of the gear changing setup. 3D printer to the rescue again! A worn heavily grooved dowel piece was .291 diameter by .75 tall in plastic. Nice to just print that in like 10mins.
Cleaned, greased, adjusted, loved..... Runs like a new machine. Now I cannot wait to make holes in somethings
If anyone ever picks up a DGP-24 unit, Ping me... Know em' inside and out now. Whew!
PS- enjoy the manual! I've attached it here.