Its very important to use new bolts when reassembling a Segway, sometimes we get units in that need to have bolts drilled out because they have snapped off.
Not the best job & very time consuming also not 100% successful.
Water and corrosion happen over time with your segway’s being exposed to the elements.
Tip: If you are taking your battery’s on & off regularly make sure the bolts are only hand tight.
Don’t not use excessive force.