GET RID of those darn 9" lock handle extensions!
Ever since I got my Drive rental wheelchair I have railed, sworn, and torn my hair because the 9" lock extensions that came with it prevented me from getting close to anything, interfered with the leg rest lowering lever, and fell on the floor when I took them off.  I searched the Drive parts listing in vain for 2" or 3" extensions and found nothing but an assorted rubber parts kit that cost a mint.  These fit the Drive brake handles perfectly, a couple gentle taps with a hammer sets them,. and for my hands (I have no arthritis) the resulting lock handles are easy to operate.  The Amazon listing says they take forever to ship, but I had them THE NEXT DAY.  Your mileage may very but for me this was the solution I wanted for a fair price in superfast time.
Rating: 5 stars