If you can obtain a patent, trademark and etc you do not need a middle man. I would contact HD and Lowes directly. Do some research and find how HD or Lowes buy thier tools, do they have an in house buyer or do they rely on an outside firm.
Does renegade want money up front or a percentage?
Before you spend any money for a attorney do a patent search on your own. That is the first thing a attorney will do. Below is the search page for the US Patent Office. Use every word you can think of that relates to your tool in the search.
http://www.uspto.gov/patents/process/search/
The US...
The first saw is Model # 103.22161 with a J rail. The second is Model # 103.21041 with a L rail. You can find manuals and info on both saws at VintageMachinery.org
Dont give up when your done it will be a great piece