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I don't see why people interpret [R28] to be so restrictive. [R28-B] has the phrase "(e.g. plywood, fasteners, etc)", which clearly opens up other parts. [R28-E] likewise has "All removable fasteners (e.g. bolts, locking pins, pip-pins, etc.) will be considered part of the Bumpers." And [R28-F] mentions "structures", without any definition of a structure or what materials may or may not be used in a structure. When I see "e.g." (==for example) and "etc." (==and so forth), I definitely think the list is not exclusive.
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[R28-B]
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hard Bumper parts (e.g. plywood, fasteners, etc) may not extend more than 1 in. beyond the end of the Frame Perimeter(see Figure 4‑4).
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The (stuffinparens) do open up other parts- as an adjective to the collection, "Hard Bumper Parts". Then a restriction is placed upon these "Hard Bumper Parts", which thus restricts all those other parts now included in "Hard Bumper Parts". It does not legalize all hard bumper parts.
If a rule specifically enumerated that all lasers in the bumper must be within 1" of the frame, it would still not legalize lasers.
You may be confused why time was taken to enumerate through these specific parts. For this, see [R28E], which specifically requires you to build something on your own. It's because of this stuff that broader restrictions are necessary.
Basically, everything in the bumper must be exactly as proscribed, except for that one part in which you must design your own mounting system. This could include hard parts (plywood, fasteners, etc), so there had to rule limiting hard parts. But because the rule proscribes a mounting system, it has to be just a mounting system, even if it seems strong enough to be part of the frame.