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BTW I'm jealousI just picked up a Littleton Shotmaker for $25.
I made one last summer.
When the lead gets molten, tap on the edge of the shotmaker to get the drips to start dripping.
I find that I can run any clean ingots, regardless of how much lead. Just don't put un-cleaned wheelweights in the tray. That would horribly clog the holes.
Mine is 4 holes, and makes a whopping 10 pounds per hour. It's relatively un-attended however, so I can be smelting at the same time.
I ladle the clean stuff from my smelter, and right into the shot maker.
You also should keep the level of melted lead pretty high (close to the top edge). The weight of the lead helps push the lead through the holes.
Rub soapstone (welders shop) on the drip edge to keep the balls of lead rolling.
Keep the cooling liquid (undiluted fabric softener from the dollar store) as warm as possible to get better round balls and avoid the popcorn effect. The water level should be about 1/4" below the edge of the drip iron. (the angle iron looking part) IN other words, you cool it immediately as it rolls off the edge.
buy.com sells some micro drill bits that can be used to produce your own shot drippers:
http://www.buy.com/prod/mini-micro-drill-bit-set-61-80-swivel-pin-vise-combo/225198290.html