'70-'72 Duster grill repair tips

And our second repair, a crack in the top of the grill. I got lucky, and the crack did not get into the viewing area of the grill. I used another piece of the plexi and cut the first piece a little shorter in length so that the piece repairing this crack was a full 10", and then I cut a small piece to scab on the back to glue the two repair pieces together.
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At this point I identified the end of the crack and drilled a small 1/16" hole through the grill to stop the crack from spreading further. Sorry for the poor quality pics here.
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We are now ready to tackle the "glue up". I had some bumper repair epoxy that I used. It is a 2 part system that cures in about 15 minutes - work fast!!! And, it remains flexible when dry. This stuff is fairly expensive as I recall. You could probably use JB Weld or something similar, although if you can find a flexible plastic product I would recommend that. Mix it up, spread it on both parts and clamp in place.
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The last repair was not really a repair, but a fix nonetheless. A tab on the lower edge of the grill broke off. This tab holds a small #6 U nut where the headlight trim fastens. Instead of glueing a piece of plexi on the back, I found a U nut at Lowes that works great. It is a Hillman U nut, part no. H#831245 and is called a "#6 wide". Not only is it "wide" to go over a thick piece of metal, it is also much longer that the one attached to the broken tab. This is long enough to slide down over that broken tab and actually grip it securely.
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Next I set the grill in place and checked to see that all the parts fit. It fit great. Back off to drill some small holes in the repair plexiglass to accept the chrome edge trim.
It probably took me almost as long to type this all up as the repairs actually took! Good luck with it, take your time and you can do a good quality repair that will last.
C