UHMW is self lubricating. If your weldment is binding or has a high friction component, fix it. Lubricating is just masking the problem and sets up another maintenance item.
These journals should be maintenance free for life when properly fitted.
Also, those flap motors are geared and a lot more powerful than one thinks. I haven’t heard of a flap motor failure due to overload. The common failure used to be grease migration interfering with the commutator in the motor.
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.