Good day fellow TACsters. I have found the easiest way to replace the draw string is to just disassemble the lower by removing the scope rail. I have had to do this three times now and am waiting to do it again. It appears to me that the weakest component on the TAC is the draw string. After only 60 - 70 shots the string has broken 3 times. The last time my arrow and the block were launched into outer space, never to be seen again and the whisker biscuit was twisted up like a pretzel. I have been waiting 3 weeks for PSE to send replacement parts.
Starting to look like I'll be Bear hunting with a gun this year. Anyway, this seems to be the easiest and quickest way as far as I know. It only takes about 15 min and eliminates all the frustration of trying to thread the needle, so to speak. Let us know if this works for you.
Cheers mates, TAC On.