The humble flat washer for the footplate assembly for Invacare Pronto Series power chairs is a fastener that helps hold the footplate assembly together. Some users might think of their chair's washers as the least essential of all the component bits that go into their machine, however, without them, your typical power chair would soon fall apart from vibration loosening the fastening bolts. The washer spreads the bolt and nut's load over a broader area providing the additional "grip" that maintains the bolt's tightness.

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