When they change manufacturers for the bottle jacks, J&S should go to one that laps the ball valve seat. I just did some load testing on some aircraft maintenance jacks. 12 out of 14 failed the load test which is to hold the load for five minutes without leaking down (25,000 lbs).
We took the valve apart on several jacks and found machining lines in them. The old jacks were lapped after machining to make them smooth so that the ball would seat and hold pressure. The Chinese apparently missed the memo on that one. The company that builds the jacks reverted back to a U.S. manufacturer that laps the seat. They found that it was cheaper to pay for the final polishing than to keep replacing the hydraulic jacks and/or valves.
I have been wanting to buy a J&S but have noticed on several reviews, that the bottle jacks fail and have to be replaced. Although the reviews always state that J&S does the swap with no hassles, it is still a hassle to pull the jack, ship it and wait on a new one.
That's great that they are making a release valve for you. The jack is a great design.
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2013 FLTRU, Jackpot 2/1/2 Stainless Ceramic Coated Head Pipes, Fuelmoto Stage 1 Intake, Power Vision, Jackpot Full Size Ceramic Crossover, MADSTAD 16" Windshield, Motolight Running Lights, Nostalgic Rails, Airhawk R, Hayden Primary Tensioner, V&H Roland Sands Slant Slip-Ons