SOLTHILL 5-Blade Enlarging Easel

Apologies for reusing images, but the condition is better than what the photos show.
This is a SOLTHILL 5-blade universal easel mask.
I believe it's from SOLTHILL, an Irish manufacturer, but I'm not entirely sure.
The inch markings go up to 16-20 inches, but I think it can actually hold paper up to 20-24 inch daizenshi (large format paper).
The fifth blade is for positioning the photographic paper, and it also has markings up to 20 inches.
It moves up and down with the left dial, which also has markings.
For borderless prints, it can accommodate up to 16-20 inch shōzenshi (small format paper).
There are leveling set screws at the four corners, which can be tightened or loosened to adjust the horizontal alignment.
I don't think the condition is excellent, but it's still usable.
Ideally, the air damper should hold it in the raised position, but unfortunately, it has lost its pressure and won't stay up.
I used to secure it with a clip, but if you replace the damper with one of the correct size and shape, it should hold at your desired angle.
It's quite heavy, likely around 15 kg.
I weighed it on a bathroom scale and it was just over 14 kg.
I tried to take a picture of the back, but it was too heavy and I gave up.
I plan to use Tanomeru-bin for shipping.