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Yesterday I went to an old school True Value hardware and quickly located the needed 3/8" PT nuts in brass for all three custom caps. Of course about the time I finished all three caps I realized that I could "make" my own 3/8" PT nuts by sawing off the female end of a quick disconnect. Tried it using my hand grinder and it was a quick and cheap solution as the quick disconnects are only 59 cents at Harbour Freight vs about $3.00 per for the brass nuts.
Even though I finished the brake bleed, making these caps got me thinking and I decided to build my own pressure bleeder as well. With a bit of looking around I settled on a small Flo-Master 64oz hand pump sprayer that cost me under $6 at Wally World. I removed the spray nozzle and clamped on some 3/8" poly tubing that ends in a female quick disconnect. Added a 0-60 psi gauge that I already had and now I have my own pressure bleeder at a cost of about $10.