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's my take on the item: TOOLS ARE COOL!! This is a tool that we constantly use in the shop on the vast majority of shifting problems. If you do everything right in adjusting the rear derailleur and still have problems shifting, t is a good chance that your derailleur hanger is bent. Fear not, Park Tool, as usual, has the answer...the DAG-1. Remove the derailleur, thread the tool into the hanger and you are on your way to smooth shifting. A must for any work bench.
Now 's what everyone else copies off the website:
The Derailleur Hanger Alignment Gauge can help solve a multitude of derailleur shifting problems, most notably with index shifting systems. This tool is extremely steady in operation and is simple to use. The tool threads directly into the derailleur hanger. The gauge bar holds a gauge which marks the distance to the wheel. The gauge then is rotated with the wheel to the 3, 6, 9, and 12 o'clock positions, noting any differences in measurements. The alignment of the derailleur hanger is accomplished by applying pressure to the tool's arm. The results can be checked instantly. The DAG-1 is made of heavy gauge steel and is chrome plated for long shop life.
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