Here's how to get a threaded filter mount like Canon should have put there:
1-take any 52mm filter
2-carefully & safely shatter and remove the glass. Warning: do so at your own risk!
3-attach any 52mm filter on it
4-thread it to the camera lens
The lens filters are a very tight fit, so use care attaching the adapter the first time. Be careful not to cross-thread it.
a) you now have a permanent threaded mount on the lens
b) you retain full use of your lens hood and can switch filters easily