Spark advance tuning made simple and quick?

[WEG1192 at aol.com]

I have been playing around with my manual spark advance gizmo and noticed 
with a timing light that even with the mechanical advance weights removed I 
am still getting some RPM based advance. Its not coming from the TPI module 
since it is only a jump of about 4 degrees just off idle (I have the timing 
connector lose). I think it is from slop due to not definitely locking down 
the rotor "mounting plate" to the distributor shaft. I am just using spring 
tension right now to lock out the mechanical advance which apparently is not 
enough. Anyone considering using this way of tuning spark timing will want to 
fix this problem.
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