I'm sure there are L-19 guys on here that can tell you exactly, but (if my memory serves me correctly) some throttles have a nut behind the faceplate or on the back of the quadrant that effectively sets the friction by sandwiching the various layers of the quadrant tighter and tighter. May see if that is easily accessible. You could also disconnect the linkage at the throttle and try to move it to see if that's the issue... Should just be a clevis bolt if it's anything like an L-5. Likely in the quadrant though. I like the throttle set decently tight (I check the friction in the T-6 before every takeoff). Don't want it backing off on you if you have to use your left hand elsewhere. If I need to make small movements I rest my wrist on the quadrant itself and lightly hold the main portion of the throttle lever (not the knob), letting my thumb and pointer finger do the minute movements. Works well, especially in formation. Just one person's technique though. Hope someone with more L-19 specific knowledge comes along.
P.S. Would love to see pic's of the L-19 with a banner in tow!
_________________ Taylor Stevenson
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