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Hi Jack

I'd be more confident of what the arrowed screw is, than what's holding the cover on but here goes:

1. I'm pretty sure that the arrowed screw is the fill/level screw.? If you fill oil through?that hole when the saw is vertical and let it drain when the saw is horizontal then you'll 3/4-fill the gearbox, which is good. It'll have enough air in the gearbox so it won't overpressurize?if the gearbox gets hot when running for extended periods and blow oil past the seals but have more than enough to lube the gears.??

2. Normally the gearboxes have a neoprene seal between the cover and the cast iron.? These get gooey from prolonged exposure to oil and stick the cover to gearbox housing.? Sometimes a blow to the edge of the cover from a hammer and soft metal drift will dislodge them but it has to be a pretty heavy blow since the seal can stretch so much.??

Looks like your belt cover hinge is mounted to an angle bracket also taken down by the upper two gearbox cover screws in the photo, so you'd have to remove the hinge and belt cover too, to get the gearbox cover off.

Those neoprene seals are a pita.? I clean off the cover and gearbox casting edges with acetone and use RTV silicone to seal them.? (brown CRC stuff in the photo)

If you damage the cover, no problem just make one out of 3/8" thick clear plastic per photo - jv