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Step 12The spark generator
The spark starts life as a chunky Biro, in fact mine was more accurately a Disney Princess biro that I found in the local pound shop and cut up so that it could serve a better purpose.
Unscrew the pen and empty if of the contents. Springs and ink can be saved for future project. Using a hacksaw cut the end of the Biro off. In my box of spare parts I happened to have a rubber sleeve that was about the right size for this job. Cut a 200mm length of the 4mm silicon tube and attach these items together with a little bit of glue. If you don't have a tapered rubber sleeve like mine then you could use a length of heatshrink shrink it at one end only.
Cut a piece of card to hold the pen in place. The basic shape should be large enough to wrap around the pen and then hold the pen 100mm away from the gun. Cut several pieces of card in a similar shape. Hold the first piece into a rounded shape using masking tape and then glue the other pieces over this first one. Laminating the card like this allows the piece to hold it's rounded shape once it has dried.
The two sides of the card are held apart wth some basla wood cut to the right width. The second piece of balsa should extend beyond the curvature of the card to provide a flat base to glue the spark generator onto the body of the gun. To add extra strength to cardboard I fabricated an H shaped piece of card to sit between the two sides.
Paint the shape with some dark grey acrylic ready for assembly into the gun
Unscrew the pen and empty if of the contents. Springs and ink can be saved for future project. Using a hacksaw cut the end of the Biro off. In my box of spare parts I happened to have a rubber sleeve that was about the right size for this job. Cut a 200mm length of the 4mm silicon tube and attach these items together with a little bit of glue. If you don't have a tapered rubber sleeve like mine then you could use a length of heatshrink shrink it at one end only.
Cut a piece of card to hold the pen in place. The basic shape should be large enough to wrap around the pen and then hold the pen 100mm away from the gun. Cut several pieces of card in a similar shape. Hold the first piece into a rounded shape using masking tape and then glue the other pieces over this first one. Laminating the card like this allows the piece to hold it's rounded shape once it has dried.
The two sides of the card are held apart wth some basla wood cut to the right width. The second piece of balsa should extend beyond the curvature of the card to provide a flat base to glue the spark generator onto the body of the gun. To add extra strength to cardboard I fabricated an H shaped piece of card to sit between the two sides.
Paint the shape with some dark grey acrylic ready for assembly into the gun
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