Wow! This product saved me over a $100 to repair our reel mower.  After struggling at first to get the handle properly attached and not realizing that our strike plate was too low, I got the blades sharpened.  You will need to adjust the mower deck/ strike plate prior to sharpening the blades or they have nothing to strike against to sharpen themselves.  Once raised to the correct height (google it), the sharpening system works great.  I did struggle to get the handle to turn the blades to stay on as it didn't want to fit our mower very well.  I did follow the instructions and washed all the sharpening compound off the blades after use and sprayed WD40 over all the mechanisms of the mower.  The mower works great again and I will continue to use this product for the life of our mower.