[BlueDragon]

My problem is the collar that determines how long the telescoping arm is. The screw that tightens the collar won’t budge.

I have to admit I've not seen with my own eyes this type of thing regarding shutters, but just now did search and find a 'clam shell awning' that had struts on either side -->here and here. Is what's in the photos there what you are contending with? Those are more sunshades than storm shutters, near as I can tell...

A bit more searching led to a small image of a adjustment 'slip collar with screw' --->here among the small images under label "Awning components".

So I think I see what you may be contending with.

How much plywood ya' got? {8^')

Eh, but maybe you won;t be needing any, anyhow.

[sparklite2]

Thanks. It is the slip collar that is frozen. I don’t have any plywood, but maybe you’re right and I won’t need anything.