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I got stuck on the core bury last night on this used cougar. No budge in either direction, no bueno.
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If you caught the core with the fix on the way in to expose it and grab the tapered core end, it will surely lock up. Maybe that happened?
When you do that tuck, that's where the lube works it's magic. My wire fid has an eye on it so I can hang it from a solid point and use two hands for the tuck. One hand massages the cover down and the other ensures that the main core inside the tuck can still slide free, which also seems to help the tuck slide in.
Before pulling the tuck in, I let the fid hang and put a couple drops of dish soap onto the two parallel fid wires and it runs right down to the point of the taper (also called the bullet). It sorta works like those chain link down spouts on houses, and directs the soap right to the bullet. That splice will finish like a champ.