I agree, 8 lbs is way over the heaviest routers that are being used and seems too risky to try. I think that you would get problems with chatter due to the systems stability. The Makita router is 3.1 lbs. Before I bought it I strapped a 4lb dumbell to the Z axis and moved it though some high feedrate tests to make sure the steppers would not skip. The Makita only comes with a 1/4″ collet but you can buy a precision 1/8″ one for $25. I doubt that an 1/8″ one is available for the Harbor freight router.