3 8 inches to accommodate center points 14 and 22 the preferable diameter of bore 53 in region 46 about 1 inch long is about 5 16 inches and in region 47 is about 1 8 inches washer 26 seats against the step 45 of bore 53 washer 26 is placed on cap screw 57 and spring 24 is then slid onto cap screw 57 washer 26 holds spring 24 in position so that spring 24 is compressed when a force exceeding the spring tension of spring 24 is placed on end 50 as noted above cap screw 57 is attached to center point 22 via a threaded hole also by providing center point 22 as a captive unit spring 24 cannot 34 shoot 34 when dog point screw 20 is released dust plug 30 replaces screw 18 when center point 22 is used since screw 18 is unnecessary dust plug 30 keeps lubricant in and dirt out of the working parts within the body 12 in operation workpieces can be safely removed and replaced with the spindle in motion the operator merely backs off the tailstock ram until the center point 22 pushes the workpiece away from spurs 16 which allows its rotation to be stopped and the workpiece can be removed to install merely reverse the procedure this ability is particularly useful in situations where workpieces do not have to be precisely centered and there is no need for testing or adjustment this type of work includes chair parts and.