jib track placement

[mrgnstrn]

so if i were a bolt on your track, i would go though the track, go down a ways (empty space) before going through the Aluminium plate and then the nut?

does the AL plate fit up into the underside of the toe rail?
(plate "A" on the pic)

does one lip of it set on the underside of the deck? if so, what supports the other side? (plate "B" on the pic)

thanks a million
-km#3