Locking and retaining slip removable bushings

Claim 1

A JIG COMPRISING AN APERTURE PLATE, A LINER IN THE APERTURE IN SAID PLATE FORMED WITH A CYLINDRICAL BORE, A REMOVABLE BUSHING HAVING A REDUCED OUTSIDE DIAMETER PORTION TO FIT IN SAID LINER WITH A SLIP FIT AND A HEAD ON ONE END OF GREATER WIDTH THAN SAID REDUCED DIAMETER PORTION, SAID HEAD FORMED WITH AN EXTENDED FIDRST GROOVE OF LIMITED ARCUATE LENGTH AND OF A SUBSTANTIAL DEPTH IN AN AXIAL DIRECTION FROM TOP TO BOTTOM, SAID HEAD FORMED WITH AN EXTERNAL FROM GROOVE IMMEDIATELY ADJACENT SAID FIRST GROOVE AND OF LIMITED ARCUATE LENGTH AND A DEPTH LESS THAN SAID FIRST GROOVE TO PROVIDE A SHOULDER AT THE BOTTOM OF SAID SECOND GROOVE, AND A LOCK MEMBER HAVING A STEM, MEANS FOR SECURING SAID STEM TO SAID JIG ADJACENT AND FIXED RELATIVE TO SAID HEAD, A WASHER AXIALLY SLIDABLE ON SAID STEM AND HAVING AN OBLIQUE UNDERSURFACE, RESILIENT MEANS BIASING SAID WASHER IN A DOWNWARD DIRECTION, SAID SHOULDER BEING AT THE LEVEL OF SAID OBLIQUE UNDERSURFACE WHEN SAID HEAD IS TURNED WITH SAID FIRST GROOVE FACING SAID LOCK MEMBER, SAID UNDERSURFACE BEING RAISED UPWARDLY AGAINST THE FORCE OF SAID RESILIENT MEANS WHEN SAID HEAD IS TURNED WITH SAID SHOULDER FACING SAID LOCK MEMBER, WHEREBY SAID RESILIENT MEANS EXERTS PRESSURE ON SAID HEAD TO RESTRAIN ROTATIVE AND AXIAL MOVEMENT OF SAID REMOVABLE BUSHING RELATIVE TO SAID LINER.