Compression Checker wont fit. M10?

[razorrust]

The M10 adapter on my OTC compression checker wont screw into the ruckus head. This is the first time I've tried to use the M10 adapter. Threads look ok. Kinda disappointed that OTC let me down.

Looking to buy a M10 adapter or new compression checker. But want to make sure it will work first.

What brand have used successfully on the ruckus?

[razorrust]

Ordered a set of adapters. Any of them should work. Except OTC I guess

[Baizy]

I discovered this as well after trying to use my automotive kit on this little scoot. I bought this: Lisle 20530 10mm Spark Plug Adapter www.amazon.ca/dp/B00CEX5B1Y?ref=ppx_pop_mob_ap_share

and it did the job without bouncing off my piston so I say it's a job well done!