Hi, I actually stumbled across that exact part on your site after I posted here, so I ordered a few to see if they will work. They look *exactly* like what I have. Thanks VERY much!
You're correct, you'll have to break it to take it out. Most vent locks must be destroyed in order to remove them.
This was my concern regarding these. They are relatively inexpensive but look effective. I'm assuming some will fail over time. Got any good ideas on how to destroy the lock (from the inside) without damaging the windows when it does happen (everything breaks eventually). (when you count all the ground windows locks being replaced, I'm up towards 30 locks. So just playing the odds).
Sure! I slide a putty knife under the lip of the vent lock and force it out from sash.