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I think your plan to fill and test is a good one. That is what I would do, except for the analysis. There is always a tiny fuzz of steel on the magnet, so analyzing the oil probably won't be able to distinguish between normal wear and serious damage. Debris on the magnet are your best tell. Signs of damage are: -Noise; whining, howling, grinding. -debris on drain plug chip detector magnet. -Serious wear can show as clunking between drive/overrun (hard to distinguish from gearbox dog clearance). -Gear teeth turning blue (pinion gear always goes first).

You won't find a slick. It will just spit the tiny amount of gear oil the bevel box carries onto the rear wheel/tyre and fling it everywhere in a spray. It won't be like losing a sump plug and dumping 4 or 5 litres of oil on the road. Phil

Ok, my bad. I revisited your first post. I read too fast through it the first time. I now understand the order of events. I can't believe you elected to ride over 200 miles home and risk a rear wheel lock up when knowing you had no oil. I thought you find that out when you arrived home. This is where AAA comes to the rescue. Also, I never expected you to find the oil plug, just maybe the slick.

I used a GoPro on ball that mounts in the hole freed up when I switched to bar-end mirrors. I just got the quad-lock system for phone and like it. Have not been recording any videos lately. But here is one I did a few years ago when I had a Greenie...

I emailed Mike Haven; no reply. This morning, I picked up the oil drain plug from them in Hempstead. I was surprised to get an invoice. Since there was one other customer, and I was on a clock, I did not say anything. I took the invoice. Thereafter, I sent a scan of the MPH invoice that clearly detailed they changed that oil. We shall see what happens.

Did you explain to MPH the reason for the "need" for the drain plug ?

This is likely the parts that have worn out: you need to replace them as a set too. Besides, I do not have a vice nor a bench. Removing the drive pinion is going to be challenging, if I needed to.