Good Luck Bob, I am confident you will NOT let them BS you
I am going to run a vacuum gauge on my primary to see if it is pulling fluid thru the clutch My first guess is NO
I dunno how many remember the old primaries, they were a drip on the primary chain from the oil pump. The return was via sealed primary, the oil got returned to the tank, this was 1 reason Harleys marked their spot LOL
These primaries could be tested to hold vacuum to be sure the oil returned via a hose to the tank
Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 37 years)
Current ride : 2021 FREEWHEELER M8, oldest ride 1960 FL