Those Allen screws are plugs, us techs use the as test ports for measuring gas pressure and there isn’t any adjustment.
As stated above, take the tube off and check for spider webs. If you do find some/ clean themmall out and then use cheap flea collars cut up to help prevent it from happening again.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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