Greetings Carrie H.,
In the past I have installed new track runners. These are made of stainless steel and snap over the old worn out rails.
I believe you can get them from C. R. Lawrence.
Check with your local home improvement company to see if they order from them.
Never use a product like WD40 on the wheels. "Alum A Lube" is the only product to use.
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