Unfasten the big round head slotted screw using the appropriate screwdriver and easily lift off the case protecting the internals- circuits and wiring.

The big round-head slotted screw fastening the internal case (181g) to the main frame is extremely difficult to remove from the case, as it has a snap lock washer which is extremely tight. Attempting using pliers to remove with no luck.

Unable to get accurate bolt screw dimensions without removing from the case.

Initially thought the main body frame is made out of an ABS like plastic, maybe bakelite but upon further inspection, it seems to be mild steel.

Length: 114.5mm

Width: 49.2mm

Height: 118mm