So I have a flashlight that had an end cap similar to the chuck but the threads were not the same. It had a lanyard on it. The part the lanyard slips through was press fitted into the cap. I pulled it out and drilled a same size hole through the Chuck end cap and stuck it in there. It's a very tight fit but I put a drop of super glue on the inside to make sure it's permanent. And here it is...
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