Kind of reminds me of something i've seen
here...
(only first look, now having a closer look i see it's something totally different. ^^)
Well yeah, it might complicate bumping.
About picking: The pin will behave like a mixture of spool and serrated pin, i guess.
Hmm, not sure about anything of the above though
Where did you find that image? Was there any description to it?
wiggle