Lee pro 4-20 bottom pour. Do the following modifications for fine flow adjustment and buy a thermometer for it or use a K-rype thermocouple and readout device of your choice.
Take out the pintle rod:
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Sharpen it thusly and reinstall:
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Remove the steel knob, redrill and tap it to the pintle threads (go shallow with a taper tap so it gets tight after about three threads, there isn't room for a jam nut under the knob):
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Make a wooden control knob or buy a wood knob from the hardware store and install it on the lift.
Now you have fine control of the stream, positive sealing of the spout, heavy steel knob pushing straight down on the pintle to help it seal, and a knob on the pintle to grab with gloved fingers to make easy flow adjustments.
The Lee furnaces are more reliable than the current chinesium RCBS or Lyman furnaces that break down, have no warranty, and no service parts available.
If you have $800 to throw at it, buy a 40# Waage. If you have $800 to fhrow at ut and two years to wait, buy a Magma.
If not, get a Lee and a lead casting thermometer for about $100, have them in a few days, and be happy.