Like i said Joe, the bolts on his are nut up, so one might fit.
The two i tried it on were nut down and the oval plate would not fit as the plate hit the bolts and would not spin.
Got plenty of small utitlity blade plates here now so i havent had to bother with it.
In the end id say the problem is just that your not doing it up tight enough.
That washer is meant to only go on one way. its marked on the washer. There is a recess in the face of the nut to allow the tabs on the crank boss to clear the face of the nut so it will clamp the blade plate tight.
Id suggest a trip to a mower shop. A new nut and new washer would not be much more than $10. Every shop ive been in has stocked them.
What are you doing it up with???
