I'm not familiar with terms like "bottle jack".
A bottle jack is a relatively small, vertical hydraulic jack. The
lifting piston comes up vertically out of the cylinder. The whole thing
looks sort of like a bottle, hence the name. It's advantage is that it
has a very small footprint, but has a lot of lifting power.
I've seen engine mounts which permit a bit of side to side adjustment
and these are nice, but what is really helpful are ones which can be
adjusted in the vertical direction once in placed on engine bed
stringers, as by turning a supporting nut.
The mounts on a 120 Lehman, or at least our 120 Lehmans, are like this.
The engine lug itself has a horizontal slot, which allows the front
and/or back of the engine to be slid side to side an inch or two. The
mounts themselves consist of the round base which is mounted to the
heavy aluminum engine support stringer, the round rubber mount itself
which sits in the cup-like base, and a vertical bolt with two big nuts
on it. One nut goes under the engine lug and is the nut that's used to
adjust the height of that corner of the engine. The upper nut is then
torqued down on top of the engine lug to lock the adjustment in place.
So once these mounts are installed, adjusting the alignment to
compensate for mount settling or whatever is actually pretty easy.
C. Marin Faure
GB36-403 "La Perouse"
Bellingham, Washington