I tried many combinations of search terms and eventually found that searching for “52mm cap pvc” returned these: https://www.aliexpress.com/item/10Pcs-52mm-Inner-Dia-PVC-Insulated-End-Cap-Wire-Cable-Tube-Cover-Protector/32739618974.html
Yep me too, better safe than sorry.
Please give us some details on the “blue taillight” on your Z1… that sounds like a sweet mod. :+1:
Sounds interesting T18!
And well I do not use the lens cap for it is a nuisance IMHO
If I put it away for longer (not likely soon) then I will use it.
> blue taillight
Misspoke, I put a couple of alignment dots of glow-in-the-dark paint on that tailcap.
Thanks, no problem.
I was just getting all excited because every time I lock out the Z1 I have been thinking I wish the tailcap were lighted. 
> 52mm cap pvc
One or two for flashlights, and the other eight or nine for, hmmm, maybe it’s time to build some fixed lighting and use these as diffusers.