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Nice, but they come in those two well known sizes - too large and too small!If you are interested in bezels, Digikey still stocks them @
https://www.digikey.com/product-search/en?keywords=led bezels.
I have also used 1/8" thick plexaglass a number of times, and have made the groves for flat head screws using a larger drill bit to do the counter sink part after I drilled the thru hole for mounting. I have a drill press that I set the speed for most plastics and it does a good job. I use minimum pressure and have no problem with counter sink holes
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The clock used the National MM5311
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj9k5vgrufLAhWBJiYKHV37AGsQFggcMAA&url=https://www.sphere.bc.ca/test/nixies/mm5309-5311-5312-5313-5314-5315.pdf&usg=AFQjCNHnexHrXDnXjU-N_qEsGdq9Zi0PCA&sig2=Uptf9QEC1FeL7WTEMjWB_w&bvm=bv.117868183,d.eWE chip.
ROFL! Such a 15yo boy!Disappointing reading the thread after reading the title, but then thought about it and realized it wasnt like i was gonna be able to add much to the discussion had been what I thought it was .
Speaking of other wonderful retro chips from National, do you remember the white noise generator, the MM5837?