pressure switches for weapon lights

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Hey,
recently received a new flashlight handguard for my MP5, but it seems as if the pressure switch is stuck (either that or faulty wiring) and as a result the light is constantly on. Is there any way to 'reset' the pressure switch, or should I just pull it off, take a gander then glue it back on? If so, what kind of glue is best for this?

Cheers in advance

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Re: pressure switches for weapon lights

Think I've narrowed it down to a short-circuit somewhere... works perfectly if I don't screw the torch in all the way.. wiggling it results in permanent-on as well... Will try a few things to see if it's fixable.