I have only used this light for one project but it was a huge project for me. I can't count the pocket holes I've drilled. Anyway, I had to learn at the beginning, especially since I did NOT buy a ferrule. I thought it was a waste of money because I had "something", "everything" to store them, or so I thought. Turns out I had some but it wasn't easy to use so it took longer. The only reason I didn't buy the clamp was because I thought it was supposed to be cheaper. So my recommendation is this. If you're buying this light for ONE project or maybe another, don't buy the clamp if you're a cheapskate, or buy it if you just want EVERYTHING. If you plan to use it often, buy a clip. I think this will save you time. Also, try to be consistent when drilling. Take your time and do it right, otherwise there will be differences in the holes. All in all, this device works great.
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