The advice about covering your viewing glass is good advice. Once your glass gets scratched you won't be able to see much. I go to the local glass shop and get a sheet of 1/16 cut to te right size. The glass cost very little and I tape it over the inside of the viewing port. Unless you have a large compresser I wouldn't get over a 3/16 nozzle and jet. Pick up a foot control for the air and a shop vac for the dust.
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