National cross slotted set screw

[AE1PT]

I am working on an NC-300, and two of the knobs have an odd cross slotted set screw that locks them in place. I have tried a jewelers screwdriver, but all this accomplishes is twisting the blade...

Does anyone know what this hardware is called, and where a tool might be found to deal with it?

[K9ASE]

can you post a picture?

[K8ERV]

I don't know what that is but a dash of wd40 or liquid wrench might free it up.

TOM K8ERV Montrose Colo

[AF6LJ]

I don't know what that is but a dash of wd40 or liquid wrench might free it up.

TOM K8ERV Montrose Colo

That fixes a number of problems with seized set screws....
There are also a number of good penetrating oils out there just remember to not get that crap on your skin. Some of it can make you ill....

[WB5WSV]

I just looked at my NC-155 and NC-190 and they just have ordinary slotted set screws for the knobs.

Aside from Phillips, there is also a slotted type of screw called a Reed Prince. It looks like a Phillips at first glance but is not, and a Phillips will not work on those type screws. Sears sells Reed Prince screwdrivers. You might try one of those if you can find one that is small enough.

Good Luck!

Robert
WB5WSV

[K9ASE]

I just looked at my NC-155 and NC-190 and they just have ordinary slotted set screws for the knobs.

Aside from Phillips, there is also a slotted type of screw called a Reed Prince. It looks like a Phillips at first glance but is not, and a Phillips will not work on those type screws. Sears sells Reed Prince screwdrivers. You might try one of those if you can find one that is small enough.

Good Luck!

Robert
WB5WSV

that's what I was thinking

[KC9UDX]

Get some Kroil. Put some Kroil on the screw. Wait ten minutes. Turn the screw in the tightening direction until you feel it move. Put a little more Kroil on and back the screw out.

[KM1H]

Just looked at mine and a customers to be sure and both use standard Allen head screws on the the knobs that use set screws. Are you sure sombody didnt stuff a Bristol head in there?

Carl