New (to us) boat has a 4" closed channel trailer with the typical bend toward the tongue. The builder collapsed the channel on the bends and makes it very difficult to pull wire through that section. Any ideas? I have already tried a standard metal fishtape, a HF plastic fishtape, a length of 12GA solid wire, a length of RG58 coax - all to get caught up on that bend.... I would leave it alone but they put a crimped butt splice on the turn signal wire about half way down the tube and it failed.