Use a ball bearing with 1/4" ID or fit a bushing into the ball bearing to accommodate the 1/4" arbor. Press fit a knurled collar to the outer race of this bearing. Use a washer (or a collar with locking set screw) between the chuck and the ball bearing plus a collar with locking...
A bushing sleeve at the end of the steel spring opposite the nosepiece retains the steel spring in position while the end of the bushing sleeve opposite the steel spring- retaining end provides a press fit for one end of a spacer tube, the other end of the spacer tube contacting the ...