AZ3 Altitude Nut Size

[davyludo]

Does anyone know the size of the lock nut used on the AZ3 (altitude axis)? 

I got a secondhand mount that was quite stiff, so took it apart to clean it all. Altitude adjustment was fine for a day or so after putting it all back together....but the nylon isn't holding anymore, so the nut has loosened enough to cause the scope to slip back at higher altitudes. 

Was just going to order a handful...but not not sure about the size. M12 maybe?

[davyludo]

Just in case this helps anyone in the future.

AZ3 alt nut size is - M12, 1.75mm pitch, Type T 

Replaced mine and it's made a big difference.