Holes in the block? Got any pics?
This was about 20 years ago from a Bro in Law, couple of little homelites (one was a homelite, not sure of the other one) and they have since been thrown away.
When he offered them to me for parts he said they were on a concrete floor under a pile of other stuff and he was drop jawed when he seen them as he picked them up off the concrete. He indicated it might have been due to sulfuric acid from battery acid in the concrete not realizing it might have just been the concrete only. He indicated they been next to the concrete floor for quite awhile (probably 5 years or more) in a outside garage storage building.
The bottoms of the saws had the paint gone in the places of corrosion and white powdery corrosion and the places in the block where the holes were through were porous around the edges of the holes and flaky weak. (might have been battery acid)
Every time I go to sit a saw or anything down on concrete floor I remember the site of those two saws. and I also see concrete floors really sweat in Okla high humidity summertime.