BC 1800 (reel) freeing from wooden frame

In order to get acces to the pcb's of my BC1800 I schould have ro remove the 4 rubber feet from the bottom according to a German sm version and then the bottom plate should come loose; by doing this 4 nuts fell into the interior but the bottom plate is not to be removed because of numerous kind of nails (no screws). Is this a standard thing or some custom solution.

Hoping there are still vintage lovers around to help me out,

regards

Aad

You will find recesses underneath each side where the real (long) screws are... two of them if memory serves. These go through the wooden frame.