Correct. I wonder, if I were to do this would it be easier to lower the strut before pulling it out for inspection or would that be more mucking around that just jamming a bigass lever on the arm. I'm going to have a search on some coil over shocks now cos I reakon this would be preferable in some respects (mainly bump steer geomtry I'm thinking) to going S13 steering hubs and arms.

So they have a threaded collar to ajdust spring height.
But unlike most others, there is a a second threaded collar at the bottom where it meets the strut tube.

Most are welded to the tube like this:

compleat tube is threded, strut screws onto threded tube.
can change ride hight without changing travel.
late model over counter adjustable strut,datsun stub/lower strut
good idea