Chevy/GMC door knocker bushing
thingiverse
a small bushing for door knocker on my 1995 GMC van, although it should work for many similar age chevy/gmc vehicles. it is a bit difficult to get on, but once it is it works very well. printed mine in PLA, standard settings higher infill -> harder to install but more durable lower infill -> easier to install but less durable you'll have to find a balance that works for you
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