Another option is to go to Lowe's and get what are called 'Acorn Nuts'. They will at least cover the end of the threads and would be a lot easier that sawing the bolts off. Here is what I am talking about, but as I said, they are available at Lowe's for about .25 each.


http://www.mmsacc-stainless.com/html/acorn_nuts.htm