- Cut 100mm of brass tube diameter 4mm.
- Insert a screw and a washer at one end.
- Drill a 15/21 brass nut in the center with a 4mm drill bit.
- Insert the spring and the drilled nut on the tube.
- Remove the plastic part of a domino diameter 4mm and screw it on the free end of the brass tube.
- Prepare a small fork in thick copper wire and place it on the domino.
- A brass threaded tube 15/21 is used to hold the moving part thus created. Cut this tube so that once screwed into the fixed part, the spring is slightly compressed when the cylinder is retracted (cold).
- Assemble everything without forgetting to pass 2 nuts around the threaded tube.
- Glue the fixed part of the ball catch onto the flat of the 2 nuts of the threaded tube.
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