I had hoped to turn this problem over to my mechanic, but when I called
him this morning, he said was totally booked up for the remainder of the
year.  Thus it setting the timing correctly is a must DIY.  I have done
this many times before, but the usual is not working.

Distributor is tending to creep towards more advanced timing.  The clamp
that supposedly holds the distributor in one spot may not be doing its
job, or I am not tightening the bolt enough or something else.  One
problem is getting a grip on the bolt head.  I am using a 10-mm socket
with a 1/4-inch ratchet,

Would appreciate some step-by step instructions on moving the
distributor to take the timing from around 10 degrees BTC to TDC.  I
know this sounds dumb, would appreciate the help.  I have an electronic
timing light.

John