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I can't think of anything OTP. But if you could weld there might be options.
Two of something like this with a section of scafold welded in between. You'd need to think of how to improve the fixings...
As cagimaha said, strength of fixing is important. But also it needs to not be so much hassle that you won't use it.
I wonder if you could fill the pole with something that would fuck up a cutter? a loose rubber hose filled with tyre sealant?
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Make it easy for your self. Different solutions on that site here. Also a wall mounted solution if I recall correctly. Shed anchor or so.
Ok so with the above in mind, my bike is locked in a set of garages (visible from my flat and 30 seconds walk from my front door. when in the garage bike is locked with the chain i use when im out and about. quite hefty had it years. I could loop the chain through the bricks at the side of the garage to anchor it. (odd garage design, the sidewalls bricks are spaced, cant imagine why) but thats clumsy and difficult to do for everyday use. so second long chain would be desirable to make that easier which I have been looking into.
Anyway that aside, does anyone know of a security solution like a big steel bar going across the inside of the garage at about knee height that you can padlock in? something so it would mean extra time to grind that off too.
Im sure its something someone with metalworking experience and the right tools could knock up quickly but I am not that person so wondered if there was anything like that already out there?