Corona bored, so whipped up an oil funnel for my rb20, features a higbee (blunt start) thread hard to capture a photo in gloss black, so ive included the fusion 360 render.
works well, screws straight in off the bed, you could make it higher if you wanted.
m32.3.5 thread pitch
higbee_rb_oil_funnel.stl | 2.2MB |