http://www.ehow.com/how_2105948_make...eel-shoes.html
Here are some very easy to follow instructions I found on the web.
I'm sure this will provide you with an inexpensive end to all your shoe comfort issues.
I'm not about to try it myself.
I'm sure if I did have a suitable shed and the right attitude and tools then I would swiftly break a nail, lose my temper, stamp my foot, get my heel stuck through the floorboards and then stuck there, have to struggle with the buckle of my ankle strap with the broken nail while an impatient delivery man rings my doorbell back in the house.