If understanding description correctly;
Most any tool grinding machine spindles are "cartridges", compared to a case and end bells like a pedestal grinder. Offhand machines only control end play for motor life. Precision grinding like cutters requires spindle to remain at position to produce equal edges.
Commonly a ball bearing at one end and two at the other, one a ball and one angular contact or thrust bearing. The spindle is threaded on the far end to adjust near zero end play (even less at running temperature).
Before proceeding, you might find a exploded view of a Deckel SO, safe bet the Pear varies little.
This case looks like all that is behind that plate (actually externally threaded flange) with two spanner wrench holes, threaded into the body, or a liner inside the casting.
Sounds as if you're equipped to make a suitable wrench for that. The easiest method seems to be a plate with a hole to clear the shaft, straddled by two holes matching center to center distance of the 'flange' holes. Drill and tap those for maybe 8mm bolts, each one end turned to diameter of those small holes. Screw the bolts into the wrench and voila!