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Re: bumper design
Our interpretation is that there should be no less than 8 inches of bumper on each end of each side. so if you have your frame at 27 * 37 and the hole is on your 27 side, then the hole will be 11 inches wide. The ball is 8 inches wide which gives you a few inches on each side. If you have a wide frame then your hole can be 21 inches wide...
Hope this helps.
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