Knob for M6 bolt, to ensure a strong grip during the screwing.
Designed for hexagon socket cylindrical head screw (such as 484-0004 or 483-8326 in rs-online.com).
 

How to assemble:

1. After printing knob and cap, take superglue on the knob hexagonal socket.
2. Push the bolt until the glue is solid.
3. Apply superglue on the cylindrical head of the screw and a bit in the cylindrical base under the bolt.
4. Insert the cap in the bolt, down to the knob surface.
5. Push until the glue is dry.