Beseler 23C II recessed lensboard

I just got a new recessed lensboard for my 23C enlarger. I though that I
understood the principle but I am confused with just how this lens board is to
used. There are 3 what I assume are adjusting screws but they are on what I
thought was the inside namely on the top side of the lens board. This just
doesn't look right.

Is there someone out there that uses on of these boards and can give me some
advice.

Alan Tippett

 

this is not screw
it is stud ( do not try to unscrew)

On the lower part of the enlarger light box , there are 3 stud
on the plastic or metal lens mounting plate there is 3 opening
you engage the larger part of the opening on the stud and turn some
5º to lock the mounting plate onto the enlarger frame.

to disassemble you just need to turn in opposite direction, to free
the lens mounting plate.

In doubt, rotate the enlarger by 90º ( for wall projection) and look
carefully at the lens mounting

 

This is different that my other lens boards which are held in by springs. Do I
need to modify the enlarger to accept this new lens board?

How to reach in and lock these studs in place?

Thanks for you input.