Yes you can.
We’re talking about the adjustable armrests. The procedure is pretty straightforward but there is one important warning. Do not unscrew the adjusting knob. Please don’t. I did do that (on one of the armrests I got on the old skanky seat I bought a couple of weeks ago ) and I haven’t managed to get it screwed back in. Unscrewing the knob (armrest on the bench, I don’t think you can unscrew all the way when armrest is on the seat) releases some part of the adjusting gubbins that appear to be inaccessible.
So don’t unscrew the knob.
Ok, on to the procedure. You know that you have to drive out a roll pin to remove the arm from the seat. It’s a little awkward as the upholstery gets in the way.
Then lay the arm upside down on the bench. The knob is pressed onto the end of the steel shaft. There are splines, and it is tightly pressed on. This picture taken after I had the knob levered al,out all the way off.
This naked arm is going to a friend who has a broken arm, you know what I mean, and her old arm cover put on. I’m digging into the other arm, the one that I unscrewed the adjusting knob all the way – don’t do that! – and so far it doesn’t look too good that there will be an easy way to get into the mysteries. The foam is cast around a plastic shell and a beech wood stiffener. Maybe more on that mess later.