Hi Deejay, Thanks for the welcome. I also have a model 45 which I am currently using on my lawns. I decided to reco the 590 because I can mow right up to the corner in my garden. I am a little confused as to the number of holes in the sole plate. The sole plate that I have has 8 holes and the existing bottom blade is channel shaped, made from spring steel. Can I purchase a bottom blade with 8 holes? Or can I use a model 45 bottom blade?