of a conventional hex key wrench as shown in fig7 being a cross sectional view of an adjusting cylinder 32 a adjusting cylinder 32 a and likewise adjusting cylinder 32 b defines a hollow interior having an interior surface 46 a which is at least partially threaded that interior threaded surface cooperatively receives a length of locking fastener 44 a therein also provided is an insert 48 a which is received within the interior of adjusting cylinder 32 a shown also in the view of fig7 is the first receiver 50 a in cylinder 32 a for receiving an end of the pins 38 a 38 b of adjuster 34 when assembled insert 48 a is captured between locking fastener 44 a and threaded pin 38 a see fig8 of the adjuster 34 whereby when locking fasteners 44 a are advanced into the interior of the adjusting cylinders 32 a 32 b insert 48 a impinges upon the pin 38 a of the adjuster 34 in that manner once the final user adjustments have been made to adjuster 34 and the locking fastener 44 a is advanced into the interior of the adjusting cylinder 32 a as described the locking mechanism 22 a is locked in place of course corresponding features are found in the other.