Black Water Valve--Adjust/Replace? ON 5TH WHEEL

[sprintnut]

1999 Kountry Star 30 RKCL
The Black Water Valve Handle will not close far enough so the Wire Keeper will lock the handle. The Gray Water Handle works fine.
The Black Valve does not leak but I'm concerned the handle could work open while going own the road since the wire keepers are not in place.
This Handle is not like a Valterra but is rounded with groves for the wire keepers. Does Newmar use special Handles, Valves and connecting rods?
These Handles are mounted in a outside compartment and the valves are mounted above the fivers belly. It appears Newmar used connecting rods to reach the Valves but I'm not sure. Once I had a RV Tech open the belly to access the valves for replacement and he said he wouldn't or couldn't do the replacement. Huh! No reason given. I'm not sure how Newmar designed this system. Maybe someone could explain this to me. Also what parts are used and a good source for replacements.
Thanks in advance,
Russ

[sprintnut]

Maybe all the Newmar owners are snow birding in warmer climates and cannot respond to this posting.
I still need advise and knowledge about his black water valve.
Your assistance appreciated.

["007"]

I added to you question subject maybe it will wake-up the 5ers.
If its a turn knob would a replacement knob with added groves filed or cut in with a saw work for you.
If you could post a picture of knob, it may help us see your problem.
I think the dealer tech didn't want to pull under belly of 5er to get at your valves for tanks.