As usual, it would be better to talk to David sooner.? I didn't do that with my first FB510 which made excessive grinding and clanking noises when adjusting the blade guide assembly up and down.? Phone calls and messages to Felder were frustrating and worse.? Ultimately, a video persuaded them that a replacement was necessary.? Even then, they thought I should do the return crating and shipping.? A short discussion of the California Civil Code solved that and the new machine has been smooth running, powerful and generally satisfactory.? Nevertheless, blade changes and veneer resawing require careful tuning and adjusting.??