Accessing Chase for New antenna Wire on 20SF

[Rybones]

I'm looking to install a new VHF antenna on my 20 SF. The boat is almost completely all original. There had been one previously mounted and the old Mount & clamshell through the cap are still there however the wiring is long since gone. I like the existing mounting location about 10in forward of the aft end of the port side fishing rod storage compartment, so I can drop the line down into that and then feed it back to the chase for the for the fuel line, however I don't know how to turn it to the port side chase that runs fore and aft with an opening just under the port side of the console. I can't seem to get the fish tape to turn that corner. Any advice or recommendations would be greatly appreciated.

(I have attached an image of someones 1973 20SF without the liner and deck just to show the chases that I am talking about, however, my boat is complete and original)