hmm thermal blow back issues indeed
I think they should check the langston valve for frictional delay. Then by using a micrometer to check for deviation in the fibre optic spectron alalyzer. You would think that if the oscillating rotors had adequate clearance, the friction modifiers would last longer. May have to break out the chiltons manual on this one, hmmm.
it may require tuning by Angus in salt lake, he fixed a friends drum set once!!
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