I finally got mine in the second try (first one was lost in shipping). Was also surprised by the blink at max but it doesn’t bother me that much. Simple mode gives a workable low but I like to have lower settings so advanced mode it will be. It’s actually one of my biggest AA-lights but I’ll edc it a while, does need a better clip thou so looked in the lights-drawer and found the one from the Utorch UT01 best fitting so will use that one for a while.
Tried my protected Eagletac’s, they fit and work fine so it seems any buttontop will do. Btw: you’ll never find a 14500 for the price of ordering one in the light and that one will fit.
I have both lights and just looked at the threads side-by-side.
Both lights use diamond-cut standard threads. There are no square cut threads in either light.
Also, the hosts (ie the aluminum parts: head, bezel, body tube, and tailcap) are 100% identical. All parts including the threads are interchangeable between the two lights. This is not surprising since the SP10Pro is just an SP10v3 with a different driver and different name stenciled on the anodizing.
The threads on SP10 are what many call square cut.
To be precise, I don’t think they are actually square cut. It seems to be trapezoidal thread. Regardless, it is not triangular cut threads you see in many cheaply machined lights.
Edit: I cleaned the lube off and looked at it more closely. I think the threads of SP10 Pro are indeed square cut threads.