A second bubble element is mounted in the central region of the level housing, and the bubble element is parallel to {HEAD ~ the length} of {TAIL ~ the housing} 
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A second bubble element is mounted in the central region of the level housing , and the bubble element is parallel to { HEAD ~ the length } of { TAIL ~ the housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL