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I removed the elements from one of my FD mount Vivitar macro focusing converters. The first three elements came out easily and last had to be broken out. I taped every opening, etc. covered it with a small cloth and hit it one with a large metal punch, using a heavy hammer. I then put on goggles for saftey, and used an air compressor to remove any and all glass debris. I had one small mark inside that i used some flat black paint to cover the bright mark. The Flash Bender is named Rogue ( Photographic Design ). , located in Santa Cruiz, CA. Try expoimaging.com , for possible information. When you use your lens on the focusing tube, you will see that you now can have two focusing rings, depending on where you set the prime lens on, say short of inf.