I have a Visioneer 8100 that will not scan. The lamp carriage went to the end and started making a loud noise (the belt trying to force the carriage). I opened it up and shoved the carriage all the way back. Now it tries to move the carriage a little and the software comes back and says it's locked. I've read previous posts that some people have moved the carriage by hand and it worked again and someone had tried greasing the shaft the carriage runs on. I've tried the pushing method to no avail. Does anyone have any other suggestions? What type of grease should I try? Thanks for any help, Steve