A reader wrote in and wasn't sure whether the Pk was a down-stroke (like M ) or an up-stroke (like T ). I'll definitely make that...

Given my experience with Gold Tone's "dojo" (dobro + banjo), where the strings are quite close to the top of the instrument at the bridge...

Just for kicks, here's the pages from my notebook showing when I started messing around with the idea of adding the pinky or ring finger...