I have a Scag Turf Runner and have just discovered that I may have mulching blades fitted. In the U.K. we are having a very wet summer and because the grass is usually wet I'm not collecting as well as I would like. My blades have a notch cut out of each end of each blade on the "lift" part. Is this a mulching blade and should I have a different blade ? My parts book tells me that there is only one type (part No. 481554 L.H. & 481555 R.H.) Can anyone help please ? p.s. the blades in U.K. are priced at £39.83 each !!