Shakmal, I just purchased the same bananas ( I think ) for surround speakers and have yet to install them. I believe you can crimp the half moon at back side to help hold wires stationary for soldering then fill that large rear hole with solder. If the wire extends far enough into connector then try to solder through the small holes towards the front as well. As for shrink wrap, I've found that quick passes with a cigarette lighter works great.
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