Not sure the number but i use a big one.the #'s are confusing.I'm pretty sure I use the 34 small one's an 35's the 150lbers.I primarily use the big one an i take my round plug pliers an very gentily round out the bottons some.I try to stay away from the ones wit a sharp bend on the bottom as they will effect the action on a plug.Never had one o those fail.
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