I've developed a taste for fresh ground pepper, but as someone on a low salary I don't want to buy an expensive pepper mill. Some spice companies sell peppercorns, sea salt grains, and dried spices etc. in neat little grinders, but you're not supposed to be able to refill them, which is a bit silly since you can buy bulk spices much cheaper from most supermarkets.
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Step 1: Oops
My first attempt at getting the plastic grinder top off the glass container went badly. I tried to use a spoon to pry it off, wedging the end of the spoon into the lid and banging it on the table. It made some cracking noises, which I thought was glue. It turned out that I'd broken the rim of the glass bottle off.
Step 2: Soften the Plastic
Later when I had another empty pepper grinder, I decided to soften the plastic before prying it off more gently. I set my oven at 250F and put the grinder inside for about 10 minutes.
The room smelt like pepper =)
Step 3: Remove Lid and Refill
Pry off the top gently. REMEMBER: hot glass doesn't look hot!. Use a potholder.
Refill with peppercorns or whatever other spice you like. I don't know if maybe some others might be too hard for the plastic grinding surfaces to handle. You may have to experiment. Also, if you look at the size of the teeth (on the underside of the top) it can't handle very big objects.
Step 4: Replace the Top
Bang it lightly with your fist until it clicks. Enjoy fresh ground pepper.