An adjustment apparatus for adjusting the position of a member on an exercise machine has an inner tube with a series of spaced pinning holes and an outer tube telescopically engaged over the inner tube and having a locator hole for alignment with a selected pinning hole. A lever has a pinning section pivotally mounted on the outer tube to extend across the locator hole, and a hand engaging section extending at an angle to the pinning section. The pinning section is pivotable between an operative position in which a pinning button projects through the locator hole and an aligned pinning hole in the inner tube to secure the tubes together, and a retracted position in which the pinning button is spaced from the locator hole. A handle is mounted on the outer tube to extend in the same general direction as the hand-engaging section such that a user gripping the handle can engage the hand-engaging section and urge it towards the handle to pivot the pinning section into the retracted position.