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Mystery Tools

chankly bore

Well Known and Active Website User
VOC Member
Difficult to be sure without scale, but possibly the large steel split holder on the left holds flywheel and mainshaft assembly and the alloy? disc and spindle could be for checking cam and pinion alignment. Look for 1"and 3/4" bore on the first and 1/2" or 5/8" on the second. Was there a large four-jaw chuck around anywhere?


Well Known and Active Website User
VOC Member
Could the brass bit be a pilot for a valve seat cutter? Hard to tell from the photo... the smaller diameter might be too small for a normal upper guide.


Well Known and Active Website User
VOC Member
The large round aluminum base with the 1/2" spindle in the center is for indexing cams. It looks like it fits on the square base, but it is upside down on the base in the photo where they are together.

There are a number of small round bushings on the RFM, Girdraulic fork or front spring boxes that need a stepped driver. The brass spindle may fit one of these.

Here is my cam indexer for comparison: