Stand it up on the motor end. You can now get at the bottom. Use a cleaner on the rod that holds the carriage. Once the grease / oil is off hit it with some emery cloth. I then use a light coat of Zep 45 which is a lubricant with a bit of teflon mixed in. Your carriage will slide back and forth easy now for as long as you own the machine.
For a leveling foot you can just run in a bolt and that will work. Otherwise PM me your address and i’ll send you a used one.
ALWAYS close the thickness adjustment when you are done. Very easy to cut yourself when cleaning, that blade is sharp. Also be sure to unplug and coil the cord if you have little kids (grandkids) around. The start switch is right on the front and kids being kids will always pull that switch.
Enjoy.