Charlie,
Healeys used mostly thin-base Shelley jacks, but the middle-period 4-cylinders
used the heavy-base King Dick B1077 for a while. These had a 3/4" socket for
the drive gear. Healey jacks had "L" shaped saddles, while MG jacks had
curved ones.
The jack handle is not quite so simple. It was assembled from three pieces:
Two parts made from 1/2"square rod and one from 3/8"round bar.
The first square bar (15") had one end that was "swollen up" in a furnace into
an onion-shaped 3/4"knob, incorporating a spring-loaded ball bearing to plug
into the jack. The other end had a 2.25" long connector sleeve held onto the
rod by two punch marks. Also there were two holes in the sleeve for the
second rod's ball bearing to lock into.
The second square bar (14") plugged into this connector sleeve with a ball
bearing. The other end of this bar had its end also "swollen up" like the
first, but it was for a 3/8" diameter hole for the third piece.
The third round bar (12") was inserted into the hole halfway to act as a 90
degree lever to turn the whole works.
The Shelley jacks used on most roadster Healeys had a 1/2" socket for the
drive gear, so the first handle piece didn't need the "swelling up" of the end
to fit the socket.
The last 3000's and convertibles of course used the red cone-shaped pot jacks
which only needed a 1/2" x 18" round bar to operate.
Have pictures if you want.
Peter
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