I made one a couple of years ago by putting a airline through a cartridge and running of a compressor using regulator to reduce flow to just cause enough to maintain constant 'leaking'. Used a light plastic tube ex bunnings style, much easier to manage than airline like to the gun. Just used gaffs tape to keep it in place.
Worked fine.
Michael T
2011 L322 Range Rover 4.4 TDV8 Vogue
Aussie '88 RR Tdi300 (+lpg), Auto (RIP ... now body removed after A pillar, chassis extension to 130 & fire tender tray.)
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