[jhgrahamjr]

Thanks Bob, this is very helpful! Jim

I think that's my video you are referring to.  The old cone had deteriorated to the point where I just needed to clear away some fragments.  I think I did use an exacto knife.  

Be aware the foam surround of the MAT cones will stick up above the frame and may press against the cabinet.  The foam is also more flexible that the original stiff paper surround.  The end result is that it doesn't sound as good as an all paper cone.