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Replacing plate
Unscrew the black plastic nut, note it has a left hand thread so unscrews clockwise.
Remove the shaft and fit it into new plate.
Ensure the pip on the plate locates into the hole in the shaft.
Tighten the nut securely.
Damage to the plate Velcro type hook surface.
Damage to the plate is rare if the tool is used correctly
The usual cause for discs not attaching firmly to the plate is because of previously using the sander without attaching a disc which permanently damages the hooks on the plate.
A less obvious cause is the false economy of using cheaper quality discs which can generate heat. The heat passes through the disc and if it gets hot enough it can melt the tips of the hooks. A similar heating effect can occur if excessive pressure is applied during use.
Catching the edge of the sander against protruding objects like nails can slice the rubber under the surface.
Old version
Flexidiscs older than about 15 years had a different shaft design with two identical steel nuts.
The old design is no longer made but a new style plate can be adapted to fit. (more details)
How it goes back together
Locate plate pip into Our way to hold it when tightening nut Ensure nut is tight
hole in shaft Note nut has a left hand thread