I got this from the recycle centre and thought it was an excellent buy for $25. I noted that the blade holder and boss were missing but didn't see the hole and dent in the sump. The original hole was about a quarter of the one in the photo as I caused more damage when I tried to flatten out the dent. I don't think anything other than TIG welding would last in that oily environment but I have heard of JB weld giving good results but would you trust it? The oil seal is damaged as well and its seat is in need of filing and smoothing out as the hole extends into the oil seal seat.
Is it worth trying some of the epoxy fillers or not? .