If you have tried using a better quality Allen wrench and still not able to get the screw out it probably means the allen slot has become rounded over. You could try the following.? Wrap some aluminum foil around the end of your Allen wrench and see if you can get at tight enough fit to take out the screw. 1st try heating from the inside where the screw attaches to the pier extension. Then try loosing the screw. Some last ditch efforts? you can try to glue a throw away Allen wrench to the screw head and see if that will hold it tight enough to work. You should also heat up the inside with this effort also. Very last effort you may have to drill out the screw head and hope to not damage any thing else.? Good? luck and let us know how you make out.
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I have a set of imperial Wera Allen Keys, the 3/16" fits perfectly.