OK - I got 3 clicks tighter by ripping apart the skin on my fingertip and shoving extremely hard to rotate collar clockwise.
Don't know why the force required to rotate the white rotate collar was so tremendous.
I plan to fire it up and keep increasing the spring tension until I get a high enough rpm - no tach to measure the manual spec RPM of 2900 +/- 300 RPM at high speed. Hope this cures all.
Update : LB revs high enough after 5 clicks, though now see a drip from fuel bowl gasket.
Only took fuel bowl apart 5 times this month.
No wonder the gasket is dripping.
Drip just appeared for first time today.
I have learned to remove carb in 5 minutes , reassembly with 2 long bolts/gaskets /heat shield/governor takes 5 hours.