I have used several tap offs for quite a few years. Have also followed this thread regarding making your own out of other materials, and references to the Gore tool ones. A few considerations. The Gore tool referred to are not tapoffs, they are cutting plates. Tapoffs leave a line to cut with the swivel knife. The cutting plates actully cut the line, much like a cookie cutter. The lines are raised to a depth that allows the outline to cut onto the leather. Tapoffs are recessed and leave a raised line to cut,actually they depress the leather around the line.
I have had cutting plates from Gore, traded them off a few years ago. I currently have a lot of plates from Richard Fletcher. He casts them, and has several "stock" flowers, leaves, and a few silhouettes. He has done some custom ones for me out of laser engraved Delrin. The plates from Richard do not have handles. They are designed to be used with a press or tapped with a mallet. The plates with handles tend to break at the joint of handle and plate if the plate is very large. Besides, Richard, Jeff Mosby in SC makes plates also, although I believe only Delrin at this stage, no casting.
Bruce Johnson