A puzzler

UKC (Uncle Ken’s Clock) had ceased to work some time ago and with time on my (bandaged) hands due to not going to art class, I decided to take a look at it in some strong daylight.
A careful wipe of the contact faces on the balance wheel and escapement and a minor adjustment to the pendulum because the left and right swings weren’t quite equal (tick longer than tock) and I restarted it.
It’s still working three hours later.
Fingers crossed……