I do not agree with the use of tritium vials outside specially designed grooves, as I consider it unsafe. They are too fragile and the tritium is harmful if inhaled. Granted, in this case the recess at the back of the TC-R1 is probably protective enough, but still not as much as with the disks.
The vote is in and blue won by far. So, here you go...
I had forgot all about it, to be honest.
It appears the best I can tell to be a 2.5mm x 0.45mm thread.
The detent ball is 2mm. I went with the Silicone Nitride Ceramic which is supposed to be harder than stainless.
This is where I purchased the balls I use… 2mm Si3N4 Silicon Nitride Ceramic Ball Bearings G5 – BC Precision?
I paid about $15 for 50 balls, plenty of spares.
I have a TC-R1 I cannot get smooth, while my 1st TC-R1 is buttery smooth. The second one came from strange origins. It was missing o rings and has the bezel of a Niteye EYE 10 instead of its own. So I fear it may have a wrong or damaged ball.
I found a source for these Silicone Nitride balls in the UK (your source moderator007 wants $23.50 for shipping to the UK). I will let you know if the ball fixes the dial.
Did you notice smoother action with these compared to the stock ball?
Yes, I have seen that, The problem is this light does not want to work well. I have opened, cleaned and lubbed it 3 times and it works semi-OK for 30 seconds and then it becomes thick and uneven. I bet the ball does not even turn.
I have taken the ball out and the ring worked freely, but I did not do it for long. As you know, opening the light requires removal of the driver first, so I will do the entire procedure when the new ball arrives, which should be within the week.
I do not think it is the grease becoming denser. I think it is the ball settling in the hole in a way it stops turning. I believe it is not round, even though I have not checked.
I will let you know how it goes with the new ball.
fwiw, some of my lights feel like there is almost no detente. Especially after I add damping grease.
Im not sure a ball is necessary. If the grease is damping enough.
I have removed the ball from an Eye10. I used extra grease to get maximum damping. To be honest, I think I used more than necessary, it is a bit difficult to turn the dial now. But it met my objective. There is no chance the dial will turn unintentionally.
At the other end of the spectrum, I have one light whose ball has an unusually strong detente. I dont actually like it, because the extra effort to turn the dial past the detente, makes the dial turn too suddenly.
Most of my lights, have an almost unnoticeable detente, so I can ramp smoothy off the stop.
I look forward to your effective solution. Totally understand wanting to wait and try a new ball. But I wish you would try no ball, until the new one arrives. You may decide not to use it, and I wont have to wait as long for your results.
I’ll throw this out there since we are on the detent ball, as a solution for a wore out hole or maybe a track groove from hole to hole where the ball rides.
This ball is about .015” bigger than the 2 mm ball which should let it ride and track in a completely different position than the 2 mm.