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I just counterbalanced my rudder on a 235 and found the following conditions.

The aerodynamic balance section is not large enough to allow even an 80% balance using lead shot/epoxy slurry.  Required 5.2 lbs.  I could only get 2.3 lbs. of slurry in the available area and much of it was too near the hinge point to provide an effective arm.

I talked to Lancair and they said to form a lead plug, attach it to the leading edge of the aerodynamic balance,  apply 3 BID over and cut out the vertical stabilizer as required for clearance.  Worked like a charm.

Hank - San Mateo, Ca. Lnc 235 ROTARY

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Please send your photos and drawings to marvkaye@olsusa.com.