Love mine, but last week it stopped working.
consider buying an EX11.2 model and swapping drivers to your D10. It looks like the electronics are the same, there is just a difference in the diameter of the driver, that could be adjusted.. (I have not tried yet)
the 11.2 driver has a wider output range than the 10.0 models. And the lower low of the D version on AA, is directly related to the battery voltage.
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fwiw,
this video showing how to remove the pill of a D10 makes the process more difficult than necessary, and does not work for EX models..
these are the techniques that work best, for me:
D10 pill removal:
It is quite simple to unscrew the pill without removing the contact ring first:
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Seeking help locating Battery Springs, as used in version 10 lights.
The gold plated spring on the right is from an EX10 Ti and is softer than the nickel plated spring used in the EX11.2 models
For me, the softer spring from Version 10 lights, is much nicer to use, and it works with protected batteries. It is not necessary to limit the Piston Drive lights to unprotected batteries, when using the softer spring.
In my experience, the resistance of the piston in the 11.2 models is not fixed by lubrication of the piston sleeve.. the battery spring is the primary source of the piston resistance.