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The lower leg bolts in my SIDS are up in the legs meaning my current selection of allen keys aren't long enough to get decent purchase for untightening/tightening.
What do folk use?
I don't, I use a 5mm regular handled hex driver. It makes tapping the press fits out much easier.
You can use a regular hex bit with a [url= http://shopping.netsuite.com/core/media/media.nl?id=101496&c=3541855&h=e4c578e9cea3c39c8530 ]T-bar carrier[/url] for undoing the bolts.
Top tip: use a small(ish) length of threaded rod (of the same size and pitch as the alu bolt) instead of the bolt itself when tapping. This way you can use all available threads in the shaft as well as sparing the alloy bolts from unnecessary abuse.