Repair spark plug lead??

Looking for info on how to repair/replace a spark plug lead of my aerolite by skytronics harness. I've made my own wires for cars and tractors, but I want to be sure before I start pulling it apart. Previous owner gooped black RTV...

Need aviation ignition lead tools

You need to get tools like these:

http://www.aircraft-tool.com/shop/detail.aspx?PRODUCT_ID=T200

and practise a few times, to get it right.

Thanks Rick.
I have one spark plug lead that I may need to fix many hrs down the road because I don't like the way one of the ferrule/nut pairs go together. I had done some light searching and had not found anything other than new harnesses or new singular harness wire assemblies.

So... after looking at the tools, I went searching for the L-1178 service manual.
I have not found that in a free pdf download yet. Anybody have suggestions or is this a purchase only item?