The Huntmaster timing cover has three different screw lengths which are not at all obvious - except for the short ones - if the screw holes are full of goo.
I have cleaned out the screw holes with a twist drill and recut the threads with a long series 1/4" BSW tap so I know that they are in good shape. However the difference between the so-called medium length screws and the long screws is only 1/8" - so it's quite easy to get them wrong.
This afternoon, worried that a mix up of screws was leading to timing case leakage, I pulled them all out. I measured the depth of each of the holes with the vernier caliper and marked the relative depths on the timing case. I took this picture:
Now I have a good record of where the screws go. As it happens they were all in the right places.
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