That makes more sense!

CD, yes, the holes were positioned away from the outer rotational part to allow oil sludge to collect there, later, stand pipes were added internally to further avoid sludge blocking the feed holes, and yes, the engine is primed by a hand or electric pump if it has been standing for more than seven days, though nowadays, aircraft are often retro-fitted with pre-oiling systems.
Hercules engines have an oil centrifuge in the return circuit to separate some of the sludge.

P&P, no, they don’t leak, nice thought though!

Pete