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What make is your HTOB? Different manufacturers have different gap requirements between the HTOB and the fingers of the pressure plate. You have to put a straight edge across the back of the bell housing and measure the distance to the fingers. Most of the instructions then require you to take a measurement from the face of the transmission to the leading edge of the HTOB and then have you set the HTOB so that the distance between it and the fingers are in an acceptable range.
If you do not have the instruction sheet, depending on the manufacturer I may have one that I can scan.
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