DO IT YOURSELF ENTRY --- PURPOSE: To provide access to a bathroom sink for wheelchair users. This illustrated article demonstrates how to modify the cabinet of a conventional lavatory to provide knee room for wheelchair users. Based on guidelines developed by the Center for Universal Design at North Carolina State University. Raising the counter height above the conventional 32 inches by one to two inches, installing the shallowest possible sink with the drain toward the rear of the bowl, and slanting the enclosure twoard the rear, and ensuring that there is seven to eight inches for the seink to clear the required 27 inches of knee space provides accessibility. AUTHOR: Greenstein, D. TITLE: Sink Modifications. BOOK: Easy Things to Make to Make Things Easy: Simple Do-It-Yourself Home Modifications for Older People & Others with Physical Limitations. REF: Cambridge, Massachusetts: Brookline Books: p 3-4. PAGES (including cover) 3. 1997.