Aircon,
Welcome to the madness!
My suggestion is this: set up your test rig with the barrels and copper tubing. Make your connections to the suction and discharge lines at the compressor with an access valve in each and a sight glass in the suction line. Chop out the cap tube, leaving a few inches of tubing at each end. Slide flare nuts on each end, and flare the ends of tubing on both sides of the cap tube. Use a flare union to connect the cap tube assembly to the evaporator tube. If you will be using a filter dryer, get one with male flare fittings and connect it to the cap tube. Put a flare nut on your condenser outlet tube and flare the end. Connect the flared end to the filter and pressurize the rig. Vacuum, purge, vacuum, charge.
The cap tube you have will work for a first shot to prove operation. Let us know what happens.
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