[HAM] BC tremulant oil threads

[Hugh]

Would anyone know how the tremulant oil threads (if there are any) 
are routed? There's a brass tube on top of the tremulant case that 
leads to either above or behind the tremulant's phenolic pinion, and 
there's another brass opening about a quarter inch off the bottom of 
the side of the tremulant case. But the motor bearing has no groove 
to retain the thread like on the other bearing or like later motors. 
Is it designed to be an oil bath a quarter inch deep with the gear 
motion bringing oil to the motor bearing or do threads somehow run 
through these tubes?

Thanks,
Hugh