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There's no brake switch. The shift lever just operates a lever on the engine case, purely mechanical.

The needle adapter shown in the first post makes it so you don't need to be straight perpendicular like with a traditional grease gun coupler, You need to make sure you're buying the blunt type like that, there are also sharp needles meant for piercing rubber in ball joints, etc. With the blunt needle adapter you basically shove it into the check ball. It does make a bit more of a mess than a normal coupler, but it does fit. The driveshaft zerks are certainly have limited clearance. The other option is a small grease gun that just fits on top of the zerk without coupling. You can see one pictured in the "rear driveshaft" pic Something like this