This is a good opportunity to mod your light to have tail cap lock out. I think DenBarrettSAR developed the concept with his Rook here. I have modified it slightly and done it to a SRK here (look at 8th pictured down in the OP). It is basically free and very easy to do as follows:
- Sand the anodized finish off the landings where the tail cap PCB is screwed down against. These landings will replace the screws as the new electrical contact points to the body. See pic below.
- Replace the screws with wooden dowels (I used cooking skewers) to keep the PCB from turning around when the tail cap is tightened and loosened. See pic below.
- Put a plastic cap from a milk jug or something between the tail cap and the PCB. You may need to shave it thinner to be able to fully screw down the tail cap
Now. Instead of locking out your SRK at the head (and putting wear and tear on the driver contact pads). Unscrew the tail cap slightly until the light turns off. The springs that press against the batteries will push the PCB away from the body when you do this and break the electrical connection.
Best wishes on finding the screw or doing the above mod.
