Little construction details take time but are either necessary or sometimes just worth doing. My Tilton brake fluid reservoirs are made with hose barb fittings but I wanted to run nylon lines with compression fittings so, there being no other choice, I sawed the hose barb off, drilled the hole larger and tapped it 7/16-20 UNF, which is the thread used on a 1/4" nylon fitting. The plastic is not very thick on the reservoir bottom, so I used a thin nut on the inside to make the fitting connection stronger. The fittings I used are "262-N 04", that I bought from Aircraft Spruce; they are intended to mate two 1/4" tubes but I simply removed the nut from one end and threaded that end into the reservoir with the 7/16-20 nut inside.
To insure a leak-tight connection, I applied a bit of Hylomar sealant (the blue stuff) to the threads before screwing it together. Now it looks like this: (see photo)
To connect the tubing, it is simply pushed into the end and the compression nut tightened snugly. It's nylon so the nut needs to be tight but not so tight that the threads are stripped.
Yes, I cleaned up the excess Hylomar.
Regards, Neil Tucson AZ