1.2 Disk holder

The disk holder is connected to the motor via a coupling between them. The disk counterface is supposed to be secured onto the disk holder and rotate in sync with it.

The various components are as shown in the picture:

Disk holder

Coupling

Motor

The disk counterface is secured onto the disk holder using four M4 screws

There may be misalignment between the holes on the disk and disk holder. It is possible to enlarge the holes on the disk holder to fit all four screws but using only two screws at opposite ends is sufficient to secure the disk onto the disk holder

There will be disk counterfaces which have faulty screw threads in them, making it impossible for a screw to be inserted properly. Since it would be impractical to soften the hardened disk and drilling new threads in them, using only two screws at opposite end is the only way left to secure the disk onto the disk holder

Insert the M4 screw into the aligned holes and tighten by hand

Using an Allen key, further tighten the screw.

Do not over-tighten the screws as it may result in the screw head being worn out. Simply ensure that the screw is hand-tight and do not apply excessive force on the allen key to tighten it.

Remove all M4 screws from the disk holder.

Insert a piece of sandpaper into the gap between the disk and the disk holder and use it to lift the disk.

Gripping the side of the disk which is lifted up, slide the disk out of the disk holder towards the user.

Do not lift the disk vertically as it would hit and possibly damage the load cell.