How do I remove this unusual floor-mounted magnetic door stopper from a paving slab?

[jmanking]

Hi, I have a floor-mounted magnetic door holder / door retainer / door stopper with adjustable hex stem on my balcony that I need to remove so I can position a new garden shed.


It has a stainless-steel magnetic head and what appear to be three hexagonal extension sections underneath. At the bottom there is a washer/flange sitting against the paving slab.


I have tried:

• turning the whole column anticlockwise;
• holding one hex section with one spanner and turning another with a second spanner;
• trying the different hex sections individually.

Each hex section seems to rotate to some extent, but then becomes tight again. If I turn the whole assembly, the whole column appears to rotate rather than unscrewing from the floor.

There is also a female threaded hole in the top of the magnetic head, but I can’t see an Allen/Torx screw inside it.

I cannot lift the paving slab because an existing shed sits on most of it, so I need to remove the stopper from above if possible.

Does anyone recognise this type of door stopper or fixing?
Is the bottom likely to be an expansion anchor, threaded insert, or some sort of concealed fixing?
Is there a particular tool or removal technique I should try before I call a handyman?

I’d ideally like to remove it intact rather than cut it off.

Thanks

 

[freddiemercurystwin]

That looks to me like three standoff bolts have been connected together to make the door stop taller. So I would expect them to undo. How much have you tried turning them? Are you using the correctly sized spanner?

 

[endecotp]

If they’re not standoffs like freddie’s pic above, could they be just nuts on a length of threaded bar? In which case you would need to start by unscrewing the magnetic head. (Which will be difficult because it’s smooth and round.)

 

[foxhole]

They should take a large Allen key down the centre? They appear to have been extended using the 3 long (extension)nuts as they are not intended for use that way .

 

[HERTS P&D]

It looks like a complete bodge.

Andy

 

[freddiemercurystwin]

It looks like a complete bodge.

Andy

Looks like a practical solution to me.