I purchased a 4ft wallace rotary mower at TSC over the weekend. I have a couple small pastures that are getting out of hand and I need to mow them back. I got the mower 3pt section togeather then it came to couple the drive shaft to the transmission. This is suppose to be a slip on shaft with a shearpin to hold it in place. I have yet to be able to slip the shaft over the transmission shaft. I tried to push it, shove it. I finally called TSC and they said use a bigger hammer. Just how snug is this thing suppose to be and then when I do get it on how am I going to allign the shearpin holes?