I recently picked up a nice K130 for my Vibroverb, but, turns out, the mounting screws in the amp are nearly 1/4 inch too short (the original CTS speaker is a thin, stamped frame, versus the heavy cast frame of the JBL). I certainly don't want to drill any new holes or drive in additional screws as this is a vintage amp. Anyone have any suggestions? Thanks, Steveokla