This was my grandmothers mower that was sitting since the 1980's in storage. I brought it to our summer house and got it started. I pushed it about a foot and it sounded like I hit something. I thought I left a screw driver on the ground but didn't see anything. Then I found a couple pieces of something that broke that attaches to the blade. I'm not sure of the proper name for it but I can't seem to find any information for this brand of mower so that I can get the correct part. It's a Briggs & Straton 3HP. I was hoping one of you could point me in the right direction. Photos attached.