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I just got two HP Signal Generators and I need information
#5

McMaster is where I get my small keys. I usually buy a few when placing an order for other stuff, as the tiny keys get easily lost. 

If you get to work on a lot of older HP and Tektronix test equipment, you will find that .050" and 1/16" are very common for the various knobs and shaft couplings.





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