STATUS: Done! (Nov 13, 2015)
The Pro-One has spacers welded to the metal front panel, onto which the main PCB is attached with screws.
On my Pro-One, one spacer had broken off. (It was still attached to the PCB though).
Now, to get a good result I needed to add some weight/pressure to the spacer once the glue was in place – but also make sure the spacer was glued at a perfectly straight angle.
I came up with a pretty clever solution if I may say so myself: I fastened the spacer to an old transformer (the one I replaced in the Pro-One).
This gave me the needed weight AND a straight angle.