Hi Kelvin, I must agree with Jim Binnion about the bottle jack.I
used to modify imported bottle jacks of good quality by doing
exactly the same thing.drilling ,taping, and installing
Gauges… this invariably gave a better Bottle jack… more
controllable for 1/2 the price of jacks made in the USA. These
were used on 3 post and 4 post (large ) Vulcanizers.Presures of
30 to 50 tons. The bonydoon system is a similar concept. Regards,
Daniel Grandi http://www.racecarjewelry.com