Alia B. from Outpost8 says
Wow, you force a hole in after it's cooked? Do you make a hole all the way through or just a small one for a screw eye? I've tried to do that in the past and my item has cracked.
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It is best for me actually I make 20-50 of the same food in a batch. Some people occasionally want them plain, or on a ring pr bobby pins, or the hole needs to be in a different place for beaded bracelets. Often I make one of each (1 ring, set of bobby pins, one pair of earrings, a charm)
Then the rest are left plain, and made after the item is ordered
Usually cracking isn't a problem in my polymer clay (premo/sculpey),
They will crack though if I didn't condition well enough. Most of my items go in the oven many times and made in layers though.. so they are completely cured.
Many times they are so hard once I have the safety pin in I use the flat head pliers to finish forcing it through. I tend to rotate the pin as I apply the pressure to make it easier.
I know this is a long answer, but it is a quick process, and allows me to go a little longer between batches
I force in a hole using pins for sewing, and safety pins