[Old metal encased power tools]

I forgot to mention that the only writing I found on it was on a bearing and it said norma made in the USA

[Old metal encased power tools]

I have an electric jackhammer, it is encased in metal of some sort, and for the life of me I cannot find a maker model number or anything on it. I have had this thing for years until I let some jerk borrow it and he brought it back broken. Theirs a piece inside that drives the hammer that is broke and I am tryiong to find a replacement or anything.