I want to widen a plastic spike that's stuck in concrete for a rotary dryer, i got a new one (dryer) and the pole's 45mm but the spike for the old one (plastic that's still in) is about 40. It's to save me digging the block of concrete out plus there's a lot of it. I thought if i could take a skiff of about 5mm off the old spike to get the new dryer on it.