3 JAW ADJUST-A-TRU SET TRU CHUCK IMPORT LATHE/ROTARY TABLE

$199.0
condition
Used
came from rotary table
i am stumped on the clearance between register dia. and c'bored plate
it is .002 max clearance (see dias. marked with green   xxxxxxxxxxx
not much adjustment???????????
could be machined for more adj.
excellent jaws and  spiral scroll plate
good pinions and mating driving  teeth
one dog point adj screw missing 
no chuck key
i cut long snout off for mount of your choice.   see pic  also false partial cut no harm  see pic
approx 5./8    high x 5" dia.  u cut dia/modify to suit your choice of backing plate
nice older well made chuck
any ? ask
any input from u why close fit  for minimal adjustment??????????