Thanks Oyster , the picture doesn't do such a three dimensional object justice really . But you get the idea .
Not all beer a skittles today ,the head of a bolt broke off and the resulting ezzy out snapped in the hole probably because I wasn't taking enough care and doing it cold . I'll sort it tomorrow .
What I did find that may be of interest was something I had thought about and discussed with Tinker , and another thing I had not seen before .
1) a hole drilled in the bottom of the con rod . you'd do this to provide extra lubrication at this point . I have seen one crank that showed bluing in this area but not normally , still . Also interesting is that in the older motors where the con-rod bolts are bottom tied and the later ones at the top of the threads . Any one know why ?
2) this hole at the top of the crank case again to provide extra lubrication for the top bush I assume . Is this factory or more recent ?
the idea of these holes is to allow better lubrication at these points and there for less frictional resistance and wear . so of interest particularly to racers perhaps .
