Unless you want to take on a larger project, I found the easiest way to address this issue is to get a cylindrical spacer the width of the contact area on the terminal strip. Then, get two washers per side to 'pinch' the large spade, and a longer screw to hold it all together. Use different length spacers for the pos/neg, so they don't interfere with one another.
If you're using banana plugs, you could try these.
If you're using banana plugs, you could try these.