I recently acquired another Trip, this one in perfect and unused condition, and it's black. While the aperture blades worked OK, the shutter would open slowly and fail to close until wound on. Using the instructions here
as a starting point, I stripped the camera down to the disk with the aperture blades on the front of it. From there it was just three more screws to get at the shutter blades. I drenched them with isopropanol, wiped them dry and used a soft graphite pencil to scribble all over the surfaces they slide over. Tricky to reassemble, but probably not if you've done much of this before (I haven't). At least I found the ball bearing I dropped, so aperture, focus and ISO all have working detents. I did have to re-assemble it twice as one of the wires going to the selenium cell got pinched and couldn't be pulled back into the body until I took it all apart again. I hope I have installed the lens elements correctly so the focus will be right - the front element can be started in its threads in two positions, but luckily I had marked the top before disassembly.
And the shutter? Working nicely. Looking forward to throwing in a film.