On the whole, these upgrades follow a gentle theme of personalizing the machine to [Marius ... replacing the swivel handle with a homebrew pneumatic cylinder made in the shop.

Most office-grade machines are as likely as ... rod and an old flange-head bolt; when air pressure is applied, the bolt is drawn into the cylinder, which locks the arm in place.

The upper half is mounted to the machine frame while the lower half moves up and down on linear rails. The lower half is held in place by a pneumatic cylinder. The operator places ...