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@Mr_Bump
I've got a new shiny chromed steel 13-23 if it's of interest (23/21/19/17/15/14/13), has removeable bolts which screw into the the 14t sprocket, you'd need to get an 11T lockring and sprocket of course.
£14 posted
Generally I'm pretty certain 7 speed road cassettes never came with an 11T sprocket back in the day, but you could rape an mtb cassette like the HG41/HG30 or somesuch and file off the ends of the supporting bolts (which have the rounded off ends) so you'll be left with 11, 13, 15, 18 & 21 and then 2 sprockets to fill in between. Obviously none of these sprockets have the screw in thread due to the slightly cheaper design comparative to the road specific ones so will be a little looser on the freewheel but not unduly so
Cheap HG41s here http://www.ebay.co.uk/itm/SHIMANO-HG30-7-SPEED-CASSETTE-BIKE-CYCLE-11-28-TEETH-/130626095808#vi-content