So I have been experimenting with different ways to hold down my material when milling.  I have tried tabs, they work but they are frustrating to deal with, slow down the cut, and leave a scar on the side of the material. I tried double sided carpet tape, it worked ok but left a sticky goo on my blade and was generally a pain to work with.  I tried painters tape and CA glue, that works relatively well except it takes a lot of tape and it is nearly impossible to line up the tape strips so you end up with glue on the workpiece or spoiler board.

What I really wanted was double sided painters tape.  Something with a paper back and not a plastic one, that was sticky enough but did not leave a residue, and that was relatively inexpensive.  I'm not sure I hit the low cost mark but I came across a product called Spectape ST501 for $19 a roll. It goes on easily, can be ripped by hand, grips good enough, and does not seem to leave any residue on the cutter.

Going back to my previous post, I had to rework my test stand. Fortunately it is easy to rework the design once you have an initial mockup.  This new hanging version reduces unwanted harmonics in the rig.

And if your curious what the output looks like, here is a plot of the frequency response of a shaker (possibly the one pictured above). X is input power, Y is output frequency, Z is output power.