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You're shaking, rattling, and rolling. It's not an earthquake, a cracked sidewalk, or an LA nightclub. The crossbraces on your folding wheelchair have come loose. The crossbrace is the center frame of the wheelchair just below the seat. In folding wheelchairs, you have twice the opportunity to shake, rattle and roll, since there are two crossbraces. If the crossbraces come loose, say if you're jostling over wooded terrain, you need to tighten them with a Phillips screwdriver.
While crossbraces are a relatively easy wheel chair replacement part to install, it's best to keep up your wheelchair repair and tighten those croosbraces. That way, when you really start shaking, you'll know it's not your chair...it's the Big One.
Actually, crossbraces require and inner rail puller to replace them. The inner rail is the metal bar that goes into the bottom of each side frame and through the bottom of the crossbraces. An Inner rail puller sorta looks like a very big easy out or corkscrew and is specifically designed for wheelchair repairs so the only place you'll find one is a wheelchair repair shop.