Using DZUS Holes for Lightbar?

wesinls

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I'm sure others have done it - I'm curious how you did it...looks like at minimum you'd need a concaved washer like the one below (my roof panel is dimpled) - to avoid damaging the aluminum...but what have others used for the other side - large washer and nylock nut?

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i did this on the old teyrx, the holes were just the right distance for the light bar. i dont remember what washer i used on the out side of the roof i know it was nothing special. but just used a nut on the back, did not have any issues with it. the spring on the back side from the fastener held the nut perfect. 

 
I'm sure others have done it - I'm curious how you did it...looks like at minimum you'd need a concaved washer like the one below (my roof panel is dimpled) - to avoid damaging the aluminum...but what have others used for the other side - large washer and nylock nut?

View attachment 24742
“Fender washers”

mcmaster carr .com find the size and material you need. I have a bunch of stainless fender washer and 5/16 tapered stainless bolts and nylock nuts if you just need a few

 
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“Fender washers”

mcmaster carr .com find the size and material you need. I have a bunch of stainless fender washer and 5/16 tapered stainless bolts and nylock nuts if you just need a few
Thanks = McMaster seems to always come through for the odd ball pieces 

 
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