lost a part for tr-j18

old_el_paseo

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i have a tr-j18. i just replaced the driver board with another oem part (the original failed). but it seems like i have lost the little ring with a button contact that holds the driver boards and also serves as a contact for the batteries and chassis ground.

what is the name of that or and where can i get just that part ? can i just build a replacment with a hardware store part ? i really need the flashlight for home renovations.

thanks for your help !
 
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