I just purchased a used (2003) Super Mini Z with a 52" deck and and Honda 24HP. I purchased new blades as recommended by Mowproducts.com and they are offset. The cutting edge is actually below the mower deck edge. I don't think this is correct. Does this deck only work with straight blades? Sorry for the newbie question, but what is the best method for changing blades? Remove deck or just lift the front of the mower? Do I need a impact wrench? Also, what is recommended for oil in the engine and hydro system? The manual does not provide part numbers for the oil filters. With the info above, can someone provide filter p/ns? Thank you for the help.