I understand why Agno's has not replied yet. Its 7 hours difference between Texas and Italy. So that means its 11:30pm at night in Italy. If they send it by UPS it might cost $30 shipping.
I have found that shops like Home Depot or Lowes sell nylon 1/4" dia x 3/8" long screws with a bolt head. Its a coarse thread. Its sort like 'White' plastic but nylon is stronger.
From Home Depot I bought a Wing Screw 1/4" dia x 3/8" long and a washer to take up the space. In Home Depot look for Crown Bolt Inc - SKU 0 30699 66728 4. Its steel zinc plated.
I think you can buy one for about 60 cents. Besure to take your camera and the bracket with you when you go...so you will make sure that the threads and screw length are correct.
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EasyPano - Panoweaver