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Step 3Make the bridge
There are many potential ways to do this. Its important that the tines don't touch the topplate directly and that they are secured tightly down to produce a good note without buzzing.
The easiest way we have found is using two pieces of wire secured to the topplate and one tube screwed down over the top in between the wire pieces, sandwiching the tines. Picture is of the Hyoutan again, but the walnut has the same procedure.
Cut your tube no wider than the topplate. Brass tube is perfect, you can try aluminium rod or thick wire, just experiment with what is easily available.
Next you have to drill two holes big enough for you small bolt to just pass through. Its easier if you secure it in a vice, not too tight though...
Once you have finished drilling file the ends and make sure there aren't any burrs anywhere.
Secure each of the the two pieces of wire into the topplate by drilling two small holes, bending the wire 45degree about 5mm from the ends and pushing it through the holes. Should be a tight fit but it doesn't need gluing or anything.
With the securing of the top tube. Place it in between the two wire bridges and mark where the holes are. Again drill two holes just big enough for your small bolts to slide through. Remove the bolts and the top tube.
With some epoxy glue, glue the two compatible nuts onto the underside of the top plate, that is the OPPOSITE side to the bridge wires. Becareful not to get any glue onto the threads and make sure the nuts line up with the holes in the topplate so the bolts can be screwed down easy.
Leave the glue to dry for a few hours.
The easiest way we have found is using two pieces of wire secured to the topplate and one tube screwed down over the top in between the wire pieces, sandwiching the tines. Picture is of the Hyoutan again, but the walnut has the same procedure.
Cut your tube no wider than the topplate. Brass tube is perfect, you can try aluminium rod or thick wire, just experiment with what is easily available.
Next you have to drill two holes big enough for you small bolt to just pass through. Its easier if you secure it in a vice, not too tight though...
Once you have finished drilling file the ends and make sure there aren't any burrs anywhere.
Secure each of the the two pieces of wire into the topplate by drilling two small holes, bending the wire 45degree about 5mm from the ends and pushing it through the holes. Should be a tight fit but it doesn't need gluing or anything.
With the securing of the top tube. Place it in between the two wire bridges and mark where the holes are. Again drill two holes just big enough for your small bolts to slide through. Remove the bolts and the top tube.
With some epoxy glue, glue the two compatible nuts onto the underside of the top plate, that is the OPPOSITE side to the bridge wires. Becareful not to get any glue onto the threads and make sure the nuts line up with the holes in the topplate so the bolts can be screwed down easy.
Leave the glue to dry for a few hours.
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