In preparation for my house being painted, I'd like to remove the security bars (a.k.a. burglar bars) from the garage window. I'd have expected them to be screwed or bolted to the wood trim, possibly with a one-way screw, but that doesn't appear to be the case. Where the screw head would be, it just looks like a lump of metal. I thought that maybe this was just due to paint obscuring the real shape, so I wire-brushed one of the lumps, but the bare metal doesn't seem any different. How can I remove these bars, ideally with minimal damage to the trim? I've considered a few possibilities, but I'm not sure what would work:
- Cutting the lump of metal off flush with an oscillating tool.
- Cutting a slot in the lump and trying to turn it, in the hope that there's screw thread attached.
- Buying an angle grinder and grinding it off.
- Removing the trim along with the bars, and then replacing the trim.
Update: At several people's recommendation, I tried using an angle grinder to remove one of the lumps. This was easy enough, but it revealed what looks like solid metal, not a washer around a screw like I was expecting: The bars don't seem to have loosened at all. What's the next step? Do I just have to keep angle grinding, removing way more metal than I was expecting to?