- Joined
- Mar 8, 2008
- Messages
- 25,504
As was mentioned earlier in the thread, mushrooming isn't always a sign that a poll isn't hardened, either. I recall seeing an old advert at one point, I think it was Plumb, that advertised their hardened polls as being softer than their bits for the very reason that it would minimize chipping while still being more resistant to deformation than an unhardened poll.