| 摘要 |
An elongated alignment bar mounting a level, a datum line pin and a vertical alignment pin has first and second internal conduits therein which slidably conduct independently adjustable flexible suspension chains from respective suspension points through either end of the upper surface of the bar and out respective openings in the middle of the undersurface of the bar. A chain lock secures the chains and provides a fine adjustment feature. A set of gauges features different colored alignment pins and an optional light mounting bracket to enhance alignment operations.
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