Now that's a good point the cutter shank diameter, I will make sure I try and get at lest 6mm.

I use DS tape for everything I cut and if needed also add bolts, bolts added when cutting carbon or alloy.

I still only use tape when machining .3-.4 carbon but then I only use .6-.8 dia cutters.

The DS tape works really well and can be difficult to remove parts once machined, no that's not saying they don't move that's why bolts was added to thicker carbon and alloy.