Barcus Berry 1457XL - Manual (Page 10)

push the Fas-Jac back into the guitar until accessible
through the sound hole and adjust the position of the nut
on the body of the Fas-Jac. Pull the Fas-Jac back
through the end block and re-measure the length of the
exposed threads. If necessary, repeat this procedure
until the proper length of threads is exposed through the
hole in the end of the block.
7) Slip the end cap over the rod and screw onto the
Fas-Jac until finger tight.
8) Remove the rod from the Fas-Jac.
9) Place an open-end wrench over the end cap and