Product review (4 stars): Helps to install INNER spring as well as outer
Despite what the description says, appliance repair videos show this tool being used to remove and reinstall the INNER spring.  I purchased this tool to do just that so I could replace the moldy boot on my LG washer.  There is no way I would have been able to reinstall the spring without this tool.  It also works well with the outer boot spring, but I have never had a problem remove and reinstalling that one with normal hand tools.

I gave it 4 stars because the ends could have been a little bit smaller.  It was tough to get the tool out of the ends of the spring without pulling the entire ring off.