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The provide fittings do not fit 1/4 inch tubing. I purchased 3/8 npt fittings for my size tubing, but they don't work. The fittings they provided are the exact same diameter, but are not 18 tpi. They are either 1.25 or 1.5 pitch (4 threads to 5 or 6 mm). The cylinder looks like it will work, but I won't know until I can work out the air fittings. Also, the bolt for the shaft is metric and I haven't been able to source a second one.