Another great idea.

Often I need more leverage or with my old hands a more comfortable purchase. For larger Allen wrenches EMT cutoffs are good for larger wrenches. For smaller wrenches I scored some hollow tubes off of old printers. The trick is to develop a supply of tubes with different bores. In the end though you can't beat cushioned T-Handle wrenches if you have a lot of screws to work on (unless of course power tools fit the job). Fatigue and Arthritis in the joints though, really make simple things like a tube slipped over an Allen wrench a huge positive.