If you have the original Geeetech A10 that was supplied without a filament runout sensor, this may help you mount one.
I bought one of the items from ebay , link below.
Fit it to the existing mounting point by the extruder with a bolt, leave the bolt a little loose so the bracket can swivel, mount the switch sensor to the bracket as in the image again leaving the screw a little loose so that the sensor can pivot, lock the nut on the bolt with glue so that it does not work its way loose.
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