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I just finished last week running doubles on my 44"/17hp all week. We had rain and snow most of the week. You need to go and buy 3 three washers with 5/8" center hole. Put your blade on as normal one in the blade collar then use the washer to help "fir out" the next blade. Most on this site run a gator blade on top and a high lift on the bottom. I used high lifts on both because thats all I had, it worked great. With doubles on that small of engine it was taxing in the tall wet grass, but does fine when dry.
I've ran doubles on my 23hp/52" Z-Master with good results.I don't feel that you need a longer bolt as long as you tighten it properly.You will need the washers to take up the space between the blades.I've thought about having the blade saddles notched to allow doubles to be tightened together.The one drawback I had was considerable blowout on the left front of the deck.Hope this helps,Richard
I tried putting doubles on my toro z but it sucked. I put 2 washers to make it fit out side of the blade saddle, the blades sat right on the saddle. I found it made my mower much more prone to scalping - I cut at 3.5 inches, and it didnt stripe very well. It works all right on my toro walk behind, and really good on my proline 21inch toro with the mulch plug in. Any one know how I can make the Z stripe better, any one offer a good kit?
I adjusted the cutting height so it took in account the blades new height. The problems is instead of sitting up inside the deck like it is designed to it sits toward the bottom and doesnot have the same give when run correctly with only one blade per spindle.