I was over at my 'heavy' site and someone recommended magnetized oil drain plugs. The OEMs are not. This site (
https://belmetric.com/) has a wide selection of metric nuts/bolts and other fasteners. No matter what, I can't tell you how many times I was looking for that odd fastener.
The freebie/deal? FREEGAUGE when you order. You'll get an M6 to M16 pitch gauge with your order until the end of December.
Had I been truly thinking - I would have ordered a magnetic drain plug for the Zongshen. I just changed the oil at 200 miles - another story.