How to Test for Air Leaks
How to Align Brackets
How to Tighten Airbag Bolts
How to Install Push-in Air Fittings
How to Install new Bushes
How to Realign Compressor Head
Installing Schrader Valves:
After you have a nice straight cut on your air line, mark 20mm from the end that's being pushed into the schrader valve with a dark marker as a witness mark, then you will know when you have pushed the airline home!
Also remember not to pull it on tight angles against the fittings as this also makes for a air leak.