Prime-Line MP3788 Non-Tilt Balance Tension Tool (Single Pack)

Works great but the hook is too long. I ground it down and it was perfect.

This a decent tool but a first time for me on a very old aluminum frame window with spring balances. My only issue was getting the hook in place and then releasing it when spring was adjusted. Perhaps spring adjust hole was just old and difficult to get at. Well made tool, however.

I honestly don't even use this for windows, I found it is pretty good for removing hair from tub drains. Twist it like you would on the window, pull the hair out of the drain, with a gloved hand just slide the hair off the hook

I had to snip off about an eighth of an inch before it would work

When cranking up the tension on the rods, wear gloves! The rod can get away from you so wear gloves to keep a good grip.

Had to repair numerous balances at my house to close on a sale. A couple of videos and this tool and I repaired numerous balances in a couple hours.

Can't install the balance springs without it

I bought this to replace numerous balances and was disappointed that the tip of the tool had some extra metal and would not fit into the balance clip. I had to file quite a bit off, and it still doesn't fit all the way in as it should. It still worked after filing, but I would recommend ordering a higher quality product.