Shimano used to make an 11-28. It's been discontinued in the US, but a few years back a Canadian member was able to source a couple for me through the Canadian distribution network. I don't know if they're still available 'up north', though.
I've replaced a lot of lunched DNP freewheels that had shed teeth.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)