so i know this was from the era when everyone thought a single pulley was less friction, so the double pulley setup was maybe really a wink and a nod ... not really a double pulley and not really a single pulley either? i ask because there doesn't seem to be a stop to set the body angle on the hanger so i guess it just goes where it wants, or does the chain length figure in there somewhere? on this build, crispy shifting ain't gonna happen if i use this RD (that doesn't matter a bit to me), but i could use some help in setting this thing up. i figured out how to set the in and out travel for the 4 speed freewheel and hub i'm using, but installing a chain next and just not sure how to determine a chain length if the body and cage just kinda float. what am i missing? BTW: running a 14-20 rear and a 34/38 front with a Simplex Competition suicide FD (maybe... cage clearance with Willaims cottered crankset arms will be real close), so chain wrap shouldn't be an issue.