Chainsaws

I am reading many posts of people who dislike the Poulan Pro tool-less chain bar tensioner and I could not agree more. I miss the old design and having two nuts to tighten the chain to the point I know it will not loosen, unless I do the loosening. My brother-in-law purchased the saw a number of years ago, but only used it one weekend and then it sat. I cleaned it out and got it running with ease, but this part is holding me back from having a working chainsaw. Can anyone please tell me what I need in order to get a conversion kit, back to the old design, for this saw? Thanks