On my last couple of flights, I saw a failure indication on the Airmaster prop controller.  3 Flashing red lights, which means there's an open circuit to the prop.  It was intermittent, but I grounded the plane until it was figured out.

First I checked the sliprings behind the gearbox on which the triple carbon brushes ride.  They seemed fairly smudgy so I cleaned them gently with a Scotchbrite pad.  Nope, that didn't make a difference.

Then I looked behind the panel on both sides to look for any loose wires and didn't find anything (I was also searching for loose grounds that might be related to the audio static).

Since nothing turned up it was time to take a look at the brush assembly since I've heard of others having issues with those.

As soon as I loosened the assembly and angled it up.... The center one just fell out.  A broken wire, which apparently others have seen.  Time to get a replacement (actually ordering 3 for future failures...) shipped ASAP from New Zealand.

A photo I took at 6B6 this past week right before an EAA Chapter meeting.

A bit earlier than the previous photo.

Before a recent night flight.  Flying into 6B6 at night is intense... A tiny runway barely lit surrounded by pitch blackness, which includes tall trees and hills.  Good thing I have insanely bright landing and taxi lights that illuminate the trees a bit before I get to them.

Those tiny small lights you see - that's what outlines the runway.