Thanks for the reply.

You are of course right, the pivot point and tool tip will be exactly the same distance so deflection will remain unchanged. However...

The mod will allow me to move the spindle (and tool tip) 35mm CLOSER to the pivot point (by raising the spindle motor 35mm in its mounts.

I'll work out the deflection angle and I'll be able to exactly predict (using distance to pivot point and angle) the deflection distance before and after.

I couldn't raise spindle any further without the mod because of tool reach.