I widened one a long time ago... I took it off and split/cut it down the middle, then I found a wider roller I wanted to use and fit it in to find out how wide the gap was. then I cut a strip of stainless that would fit the gap, and welded it all back together.. other than this, there is no way to do it.... unless you just need it a quarter inch wider, then you may be able to bend the tips where the roller is, but you probably wont like the results, nor will anyone else you try to sell it to when you decide to take it off and get yourself a bigger one.