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| sparky961:
I haven't tried this, so do a test on something that doesn't matter first... Fasten it using your favourite mild steel fastener with either a Philips (square) or hex drive head. After doing it up nice and tight, drill out the drive pocket just slightly larger than the circumscribed circle so everything cleans up. Think of it as purposely and thouroughly stripping the head of the fastener. It should end up looking a bit like a rivet when you're done. |
| sparky961:
.... of course, depending on the desired level of security, a hammer and cold chisel or a cordless drill could easily defeat your efforts. I suppose this is true of anything called "security" though. If someone wants "it" or wants "in", it's just a question of how long it takes and how likely you are to be found out. |
| vtsteam:
I'd suggest that on an exterior wooden door that, at least, screws can be tightened in the future, as things tend to go loose with changes in humidity. Under higher humidity the wood swells under the plate but being bolted stationary, the wood surface gets compressed slightly. Then when humidity is low, the inner wood shrinks again pulling the crushed fibers away from the plate. This doesn't usually happen all at one go, but over time it will loosen. So being able to tighten the screws is important. And if there is ever need to remove the plate, it's a lot easier if the conventional practice of screwing it on from the insde is followed. |
| ven:
Thanks very much for the suggestions. I had forgotten all about shear screws, if that is what they are called. Screwing from the inside into bosses seems to be about the best, as it would allow adjustments and removal if necessary. My father was also a Royal Engineer and told me lots of things, but not about washing soda! Ted, in Lincs |
| steampunkpete:
Shear screws / bolts and one-way fixings are OK, but as has been pointed out one is b******r if maintenance is needed. The way I would do it would be hardened screws or bolts right through the door and nyloc nuts on the inside. Mr. Vandal can then try and undo the bolts as much as he likes, but with no spanner on the inside the bolts just go round and round. However, Mr. Burgular is unlikely to spend a lot of time trying to nick an escutcheon, and Mr. Vandal probably isn't either - so is the engineering solution in proportion to the risk? Damn great clout nails have successfully secured church door furniture in place for centuries after all. |
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