Got it brand new in the mail the other day.

Question #1: How do I install the carb so I can compress the O ring? Do I just push down as hard as I can and tighten the compression screw and nut at the same time? I'm concerned that it will leak air. The compression fitting doesn't pull the carb down onto the O ring.

Question #2 Do I put thread lock on the compression screw and nut?