Was in the process of thinning down the inside top of a hollow form and felt the control arm rotate ever so slightly. BAM! Had a catch but didnt blow up the form! Managed to push the cutting tip deeper into the form just as I noticed the rotation! Whew!
Still, it took some doing but managed to smooth out the ripped area inside the form and the thickness went from 1/8 to 1/16! So, I guess the thinning part worked!
I have the Monster Articulated Arm Hollowing System and wanted to warn everyone to check the set screws that hold the control arm to the body of the articulated arm. See photo below. Like anything mechanical, things tend to loosen up over time when subjected to vibration. I do not have Lock-Tite on mine at the moment but will apply some later. I have labeled parts so everyone knows what I am talking about even though some of the terms may be incorrect.
Attachment 32993 Attachment 32994 Attachment 32995
Hope this warning comes in time to prevent others from experiencing the same type of catch!