Not really, you could fill the gearbox from either plug hole actually. Its just easier to use the top hole with a small funnel.
If you remove the one near the kickstarter, you will see the nipple on the end of the clutch cable and how it locates in the end of the arm.
You need a 1/4 moon type of spanner to take the plugs out, a large washer in a set of vise grips works. I made my own decades ago, used an angle grinder shape the 1/4 moon, and oxy to 90 degree bend the steel strap.
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