I just opened the two garage sale Frams. Worked pretty well. They are small filters and so there was less flex in the can which may have helped. Seems the one I tried was a Motorcraft FL1A and it kept crushing the can. I think the trick is to get the cutter close enough to the metal base plate to add some support to the can. This was easy on the frams as the lip on the can is inset vs raised on many filters. Will try on my next filter, a Wix. Also, when rotating the filter it seems to work better to rotate counter clockwise (from the closed end) through the cutter so you are coming into the cutter from above, not below. Tracking is the other problem as the can wants to wobble, so I had to continually direct the can to keep the cutter in the right place. Once it breaks throught, it seems to cut pretty well. I would like to rig this horizontally though so oil would not drip out during the cutting. Anyway, I think I have begun to get the hang of it. Thanks MonumentOiler.