I bought a blank Do-It mold from someplace and drilled it out myself on the drill press. I stick a pieces of coat hanger wire in and pour the lead in, before opening the mold, pull the wire. Some oil on the wire helps it not to stick too much and be sure the wire is straight also.
This is a good way to pour your own the length that you need and the diameter you want for specific plugs you make yourself.
If you can't deal with that or don't want to, m&d's has plenty all done up ready to go.
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