Airleakage

Concerning airinleakage on the locked nut of throttle arm tightened on the throttle butterfly center shaft, all the time I'm obliged to think over about the airinleakage on Solex 34PICT3 disassembled last Sunday.

I found out some bubble come out through threaded grove of lock nut when I had applied some pressure from the butterfly throttle to the center shaft. The phenomena some bubble formation means airoutleakage, at the same time airinleakage when it is functioned on the AD motor?
Though the leakage from the adjacent parts center shaft and carburetor case is reported, that from the groove of locking nut were not experienced in the Web sites.

As a countermeasure, coking material application is imagined, silicon sealing material considering the hottest atmospheric using, the temperature in the engine room must exceed 120 degree Celsius.
Probably the volume control and bypass screw position would be completely changed after the modification preventing airinleakage.
I'm looking forward to to know what will happen in the experiment!