known to the art is the employment of this pressurized hydraulic fluid to work against the one end of ram 14 recessed into jack housing 12 causing ram 14 to controllably extend away from and retract toward jack housing 12 with substantial force f having substantial lifting capacity in this fashion ram 14 may be described as being telescopically attached to jack housing 12 a jack shoe 17 is provided on the opposite end of ram 14 from jack housing 12 generally considered the top of jack 10 to provide an interface surface to an item to be jacked not shown as known in the art prop 40 is attached to travel jointly with ram 14 referring to fig1 and 2 exemplary jack 10 has a pair of elongated rigid members comprising prop 40 that are disposed on opposite sides of ram 14 oriented generally parallel to ram 14 as controlled by jacking mechanism 16 in lifting operation or lowering operation the individual components of prop 40 correspondingly fit into storage wells 22 in jack housing 12 such that prop 40 and ram 14 may similarly and correspondingly both extend from in jacking mechanism 16 lifting operation and recess into jack housing 12 in jacking mechanism lowering operation prop 40 possesses a series of pin receptacles 42 arranged spaced apart along the length of each component of prop 40 from the end recessed in housing 12 to the end adjacent to jack shoe 17 pin receptacles 42 are disposed in prop 40 to permit the engagement of pin 50 in the exemplary embodiment pin receptacles 42 are transverses perforations in prop 40 in the exemplary embodiment pin 50 is comprised of a pair of pin shafts 52 that extend in one direction with a pin handle.