...The spindle, or long trigger, is about the size of the prop, but should be sixteen or eighteen inches long with a prong cut off within two inches of the end to help hold the bait on more securely... 
A. R. (Arthur Robert) Harding 「Deadfalls and Snares」
...The bait should be tied on or the bait trigger may have a prong on to hold the bait...
A. R. (Arthur Robert) Harding 「Deadfalls and Snares」
...You cut a stake, sharpen it at one end, cut it about 15 inches long, about 1 inch in diameter; leave a prong about three inches long and about three inches from top to stake down trap...
A. R. (Arthur Robert) Harding 「Fox Trapping」
...Cut a forked stick, one prong one inch long, the other 6 or 8 inches long; sharpen it, run your bait on this, put the stick in the back of the hole which fastens your bait...
A. R. (Arthur Robert) Harding 「Mink Trapping」
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