Linerlock folder: use of "D" shaped pivot?

Joined
Mar 27, 2009
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Does a linerlock PIVOT need to be round or "D" shaped?
R.B. Johnson's drawing does not show a "D", nor does he sell "D" shaped pivots.
AKS sells round pivots.
Should they be filed into a "D" and the hole made to match?
Bob Terzuola's book on tactical folders says on p. 98: "Punch the anti-rotation "D" into the pivot hole using a slightly domed punch...My pivots look like a "D" because there is a flat illed into one side to prevent the pivot from rotating when the blade is opened and closed...A cross pin in the pivot which fits into a small slot in the handle may also be used."

Of what use is the "D" shaped PIVOT?
When, if ever is it necessary?

Separate question:
Is a pivot BUSHING only necessary on a slipjoint, not a linerlock?

Pardon the repeat. I asked in another person's thread, but did not get a full answer, and did not fully understand the answer in the context of the other thread. I'm trying to research ahead of asking, but as a beginner it is hard to understand some things that are obviously simple for others. It's the same in my field where asumptions of knowledge and jargon rules even though people are trying to be helpful. :o
 
On screw-together pivots, sometimes as you tighten the pivot, the entire pivot barrel can spin rather than tighten (same idea as then you are tightening a nut and the bolt its threaded onto just spins). Some get around this by having one end of the pivot barrel a press-fit, othersuse double-threaded pivots and tighten from both sides, and others use a d-shaped pivot to prevent it from spinning. Theres probably even more ways than that to skin this cat, but they are all accomplishing the same goal of allowing you to tighten a pivot.

I'll let someone else answer the bushing question as I am not an expert, but bushings arent really "required" on anything...they just make some things better/easier.
 
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