Important note: do not use the cutting edge of your knife to strike the rod. You will leave a nice big nick in the edge if you do. Hacksaw blades are a standard, piece of steel fish tape or small steel flat springs are mighty fine and about as small as you can handle.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)