I have an old (but little used) Ryobi R160 router mounted to a Ryobi table. I was recently routing a groove in some pine and I believe the shaft must have broken. The bit is now off-center and I cannot lock the spindle to remove the bit. Contacted Ryobi, but the router is so old the "teenager" on the support line couldn't even confirm that Ryobi had ever made this unit, much less help at all (the router may be older than he was). I cannot even find a good parts diagram. Any thoughts on how to tear into this?