The 3-point arms on my L275 seem to hang too close to the ground, and as a result they won't lift my tiller or bushhog as high as they should. It becomes a problem when maneuvering over rough ground as the implements want to drag at times, even though fully raised. Is there a relatively easy way to change the height of the lift arms? They are splined onto the rock shaft but it didn't appear very obvious how to remove them as there are no retainer clips or anything of the sort that I could see.