In message , John
writes

If you were to lower the shutter and it stuck at the bottom - then if the
roller was free I would expect the shutter to be in some compression due to
the weight of the higher slats.

Umm...

I suppose: if one turn on the spring counterbalance gives less *pull*
than one turn worth of slats.

The only one I have had apart needed to be held down while the bolts
were engaged.

regards

--
Tim Lamb