Total was at one time private labeled for Tilton by Sabre.
Tilton is now having Carlton private label it.
Sabre&Homelite were bought by John Deere. JD sold them.
It is possible to have a batch of 'hard' cutters, but usually alot of people in that same area do that bought from that dealer.
More likely than not, something was done that weakened the cutter. But nobody ever does that.