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You need ginger! It's on the page you linked however I can't stress enough how effective it is.

All you do is shave off the skin with a knife and shape it into a rod. Then insert it into your slaves anus. It will take a bit but the pain will become unbearable. It's safe and very effective. I can't stress how great a punishment tool this is.



You can read more on this topic here:
http://www.leathernroses.com/generalbdsm/figging.htm

Buy the largest hand [of ginger (see picture above)] you can find and scurry it home. Keep the entire hand in a cool dry place until you are ready to use it. The sooner you use it, however, the better the effect unless you age it properly which I'll get to later. When play time rolls around, I usually like to have my sub bound, face down on the bed over a pillow. No blindfold here. I make it a point of allowing her to watch and hear me prepare the ginger. The anticipation is spectacular especially if she's never experienced it before. The gyrations generated from the anticipation alone are well worth the experience. Now you are ready to cut a finger of ginger from the hand. Unless the fingers are very long, do not cut the finger off at the joint of the hand. Remove the finger by cutting down into the palm of the hand so that you get a long, uniform width finger. I like to use a finger no smaller than 4 inches. Longer is better. Take a paring knife or vegetable peeler and remove the brown skin. Make sure all the skin is off as well as insuring that all the bumps and knots are cut off and smoothed as well. Try not to remove too much meat underneath, as you want to retain as full a finger as possible. Take your time and don't rush this step. As you work, rinse it under cold water periodically to help wash away pieces of skin. Ginger is fibrous and sometimes takes a little time to prepare properly. If you're into oriental cooking, you'll love the delicate ginger aroma that is
released as you do this step. The smell is a great stimulus for the sub as well. It heralds
things to cum (yes, pun intended). After you have the skinned root all smooth and nice, you now have to perform the tricky bit. With the paring knife, about two-thirds of the way down the root, carefully carve a concavity around the finger. This will act as a retention device. Similar to a butt plug where the sphincter locks around the tapered portion of the plug, the concavity will do the same thing. Make the ring no more than a half inch wide. Remember; do not taper the finger all the way down to the end. You want full circumference of the finger two-thirds of the way down, a half-inch retention ring and then full circumference continuing down to the end of the finger. Do not carve out too much however, as this will weaken the finger and increase the possibility of breaking it while in the sub. You don't need a very deep ring for retention.

After you have carefully completed this step, rinse the finger off and dip it in cold water. Make sure the tip of the finger is sufficiently rounded. You can always touch this area up with a knife or peeler. Now it's ready to insert. Unlike your own finger, you do not use lube with a ginger finger. Lubricant acts as a sealant and prevents the ginger moisture from doing its thing. Instead, use the cold water to keep the finger wet. Slowly insert the finger into the sub's anus. DON'T RUSH HERE. TAKE YOUR TIME. Wet ginger is slick enough to slide in with care. When the anus finally
opens and accepts the ginger, slide it in up the ring and let the sub close around it. The beauty of ginger is that it takes a little while for the effect to take place. Once it begins, it builds steadily. While you are waiting for the fun to begin, go wash off your hands. You don't want to touch your eyes or your sub's eyes by accident with ginger on your hands. Now sit down in a comfy chair and enjoy the show. Most submissives will become rather vocal as the ginger works its magic.