First off....... I'm pretty new at router use. I have a PC890 that is less than a year old and I can't seem to keep the setting. As I use it, the bit keeps dropping lower. Thia may sound dumb but can I be doing sowthing wrong? I tighten the bit, put the machine in the table and set it up. I open the lever, adjust the height and close the lever. I also tried to adjust with the lever closed but with the same result. Perhaps that model is not the best for that application?