If a knob is broken, or stripped, it will not be able to tighten up firmly. Remove all knobs by turning them counter clockwise, all of the way, to remove. Examine the threads and replace any that are stripped. At this point, check and replace any weak springs as well as replace any springs showing signs of wear. Remove any washers from the old knob assembly and install them on the new one. Install the new knob into the base.

If a lever on the base is worn, or broken, it can easily be replaced by taping the pin out – that holds it in place – and remove the lever. Install the new lever and the pin and then tap the pin in place.

If the collet nut is missing, or damaged, this will impact the operation of the base. Simply remove the collet nut and install a new one.

If the support pin is stripped, it will not be able to lock the base firmly. To replace the support pin, remove the pin holding the lever in place. Remove the nut and washer on the opposite end and pull free of the base housing. Remove the washer and install it onto the new support pin then slide the new support pin back into the base housing. Install the washer and nut. Reinstall the lever and pin, holding the lever in place, by taping it in with a hammer.

If a base is so badly worn, that it cannot be repaired, or the threads on the base (threaded openings used for tightening the base down) are stripped, it will need to be replaced. Remove the old base from the laminate trimmer and install the new base.

If the base plate is broken, this will impact the base. Remove the screws securing the old base plate, then attach the new base plate and secure it with the screws.