I have a pair of spike heels that I would like to sharpen and give metal tips. Right now the tips are about 5mm wide D shapes, made of hard plastic. What would be the best way to go about this? Are there any problems with wearing needle-sharp heels, and has anybody done this before? I have heard good things about concrete nails and awls as heel tips, painted black of course.
The image below is an attempt to sharpen some heels just by removing the plastic with a hand file and leaving the metal post, but it is kinda amateurish looking plus the post is about 4mm diameter, I want them to be sharper than this.