Replacement generator terminal wire is way too stiff

[Sparky]

I'm talking about the internal wire from the generator output brush to the terminal stud. The cloth insulation on my original wire was falling off and I was afraid of a short , so I ordered a new replacement. The gauge is correct, but the plastic insulation is way too rigid, so much so that it overcomes the spring in the brush holder and will adversely affect the brush force. So now I'm thinking of applying liquid tape to the original and putting it back. Will this hold up? Any other suggestions?