You are allowed to extend anything you want as long as it stays within your robot volume. However, your robot must start the match with everything inside it's frame perimeter (If you wrap a string around your robot without the bumpers on), your bumpers aren't inside the frame perimeter so your mechanism would need to extend outside the perimeter after the match starts.
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STARTING CONFIGURATION:
the physical configuration and orientation of the ROBOT at the beginning of the MATCH where no part of the ROBOT shall extend outside the vertical projection of the FRAME PERIMETER, with the exception of its BUMPERS and minor protrusions such as bolt heads, fastener ends, rivets, etc.
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When placed on the FIELD for a MATCH, each ROBOT must be: confined to its STARTING CONFIGURATION,
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