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BT 99 PLUS RIB ADJUSTMENTS

1994 3
How much adjustment is there on the rib of a 32" 99 Plus ? How do I get it to shoot a little higher/lower & what are the incrumentss ? I don't notice an indent or anything to indicate a click by the rear screw & what about the front of the rib adjustment ? I'm really at a loss here can anyone help with this that actually has one or had one ?
Thank you for your time.
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