Bowl and cover problems

I use mine quite a bit, and one of the things I do often is grate cheddar cheese. The last couple brands I owned had a difficult time with this task, but the Oster has a powerful, fairly quiet motor and has no problems.
But...
I am on my fourth replacement bowl and third cover. The bowl has a plastic mechanism that both locks the cover and activates the safety switch when the cover is in place. This plastic mechanism keeps breaking. Also the tabs on the plastic cover sometimes break off - this is probably due to the stress on them when trying to get the cover off when the handle is broken.

I keep buying replacements because in the short term it's less expensive than buying a different brand, which I might not like anyway, and I really like the base unit.