Here's a visual to further explain the reason why you use 3/8" instead of 1/2" (which was the original question):
[ATTACH=CONFIG]367480[/ATTACH]
Please excuse my pathetic Paint skills - the drawing is not to scale.
I totally agree about cutting larger and trimming down.
But I think it's always helpful to know the reason(s) why.
Last edited by MTS; 10-04-2012 at 05:56 AM.