Actually, onestrangeguy answered your question. If you HAVE to make it yourself, get a dildo, cut it to the length the you want, and attach a strap. If you can't figure out the details of how to do that, you probably should just buy one. If you insist on making the penis part, you're on your own. That has been discussed in this forum several times, and no one has really come up with a good method yet.
I personally used this one, and adapted it to a trainer harness, which I made from leather straps. It can be interchanged for a ball or ring as well. One harness, 3 gags! http://tantusinc.com/mm5/merchant.mvc?Screen=PROD&Store_Code=TD&Product_Code=FANGAG&Category_Code=SI
There's a fine line between cuddling and holding someone down so they can't get away.
The beatings will continue until morale improves.
Do not meddle in the affairs of dragons - for you are crunchy and good with ketchup.