no outer skills for pics as borne in 1959 but will describe best I can. 1st buy a foot long piece of 30mm thick wall square tubing (oblong shape will work as well),while it out buy a length of 1/2 inch all thread and 3 nuts to suit.now chrome find centre of the tubing and drill a clearance hole through the tubing,if u have a welder weld a nut on the tubing if not use the nut on the under side of the tubing.now exit 10 inches of true all thread sand grind a point on 1 end of it,now lock the 2nuts together on others end of the all thread. now measure the centre's of the jacking threaded holes of it cases and drill those holes in the tubing and ur done