I just refinished my wooden table from my 310. I wanted to add cupholders somehow, but didn't want to screw up the table or interfere with the folding of the table. I had some grand ideas to embed super strong magnets in the base of the table and then attach the cupholders magnetically. It got kind of complicated and I sort of worried about what the magnets would do to people's watches or other magnetically sensitive items, so I punted. Still looking for a "temporary" cupholder concept that doesn't require altering the table.