How about a description?
You'll need:
16" length of 1/2" hard copper
1/2" copper cap
1/2" to 3/4" copper reducer
3/8" copper washer
~18" of 1/4.20 threaded rod
three 1/4.20 nuts
universal/cartridge coupler & pin
5/16" x 1" coil spring
1/4.20 threaded knob
It's ~16" of 1/2" hard copper soldered to a 1/2 to 3/4 reducer. Drill a 1/4" hole in the center of a 1/2" cap and solder the cap onto the other end. Then the reducer is cut in half length-wise to create the cup at the end. A copper washer is soldered to the end, then slotted to a "U" to allow the cup to slip over the shaft, behind the gear.
Take the threaded rod and drill it to accept the pin & coupler. It's a snap fit, and you may need to disassemble later so don't glue it. Disassemble and set aside the pin & coupler.
Slide the threaded rod through the reducer end of the copper (the pin goes at the cup end), through the cup opening string thread on two of the nuts and the spring. By trial & error position the lock nuts as a stop for the spring, allow enough room to insert a replacement gear, and enough travel to release it when it's in position. When you have it close, insert the pin & coupler onto the shaft. It took several dissassembly/re-assemblies to get the lock nuts in just the right position.
That was the fiddley part. When you're satisfied with the positioning of the lock nuts, thread on the third nut on the cap end of the threaded rod. Tighten this last nut until it leaves enough action to hold the gear and release it. Cut off the threaded rod at the cap end, leaving enough additional thread to accept the knob. Screw on the knob and snug the third lock nut against the knob.
Obviously the soldering has to be complete, and cooled before you can insert the plastic coupler. If you decide to try it please post a photo.
As you can tell, I'm not much of a photographer, but I'll take another shot at it. =^..^=
You'll need:
16" length of 1/2" hard copper
1/2" copper cap
1/2" to 3/4" copper reducer
3/8" copper washer
~18" of 1/4.20 threaded rod
three 1/4.20 nuts
universal/cartridge coupler & pin
5/16" x 1" coil spring
1/4.20 threaded knob
It's ~16" of 1/2" hard copper soldered to a 1/2 to 3/4 reducer. Drill a 1/4" hole in the center of a 1/2" cap and solder the cap onto the other end. Then the reducer is cut in half length-wise to create the cup at the end. A copper washer is soldered to the end, then slotted to a "U" to allow the cup to slip over the shaft, behind the gear.
Take the threaded rod and drill it to accept the pin & coupler. It's a snap fit, and you may need to disassemble later so don't glue it. Disassemble and set aside the pin & coupler.
Slide the threaded rod through the reducer end of the copper (the pin goes at the cup end), through the cup opening string thread on two of the nuts and the spring. By trial & error position the lock nuts as a stop for the spring, allow enough room to insert a replacement gear, and enough travel to release it when it's in position. When you have it close, insert the pin & coupler onto the shaft. It took several dissassembly/re-assemblies to get the lock nuts in just the right position.
That was the fiddley part. When you're satisfied with the positioning of the lock nuts, thread on the third nut on the cap end of the threaded rod. Tighten this last nut until it leaves enough action to hold the gear and release it. Cut off the threaded rod at the cap end, leaving enough additional thread to accept the knob. Screw on the knob and snug the third lock nut against the knob.
Obviously the soldering has to be complete, and cooled before you can insert the plastic coupler. If you decide to try it please post a photo.
As you can tell, I'm not much of a photographer, but I'll take another shot at it. =^..^=
, we got a few of them BC's left, and it will make it easier on them when I have to change them gears.
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