I bought a Garmin mount with a Knog PWR Trail attached, it worked but the twist switch didn’t respond. I attempted to repair it and… it was a success but not much fun. In case anybody wants to try, here’s what the insides look like.
The way in is through the lens. Unfortunately it’s installed with a snap ring and the way it’s buried in the head there’s no good way to get it out. The only way I can see is to lift the lens and snap off the section below the snap ring - fortunately it’s pretty thin.
The snap ring is visible here
The jagged part is below the retaining ring and is the part that needs to be broken off the get the lens out. One of the removal tabs on my lens got snapped off completely during this process; I reattached it using UV resin.
I suspect these lights are more prone to problems after being dropped, which is liable to damage the lens and make it more likely to crack while being extracted. Wear eye protection and good luck. The white shroud is held in place by the lens but not attached to anything.
Two screws hold the electronics in place. These are why the lens has to come out. They seem to be the main power conductors for the LED board.
Ring at the rear is threaded, a watch wrench or divider will get it out.
And then the electrical unit drops out. I don’t like the support tabs being made of the PCB, but it works… the cut and folded plastic tabs adding some retention are even worse (reminds me of HP heat spikes). Anyway, the red plastic is fairly soft so the top PCB can be popped out.
Fairly easy from here, lift out the top PCB (mind the spring but it’s not under much tension) and unscrew the lower logic board. The problem is visible here - two of the wires between the PCBS have snapped due to a lack of strain relief.
Orientation of the wiring, just in case anyone needs to rewire all 5.
Based on this (and my dead Oi, and my off-key Oi, and my dead PWR Rider…) I’m not inclined to pay for Knog stuff again. Still, free-ish light/power bank isn’t bad.