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RV-7A Construction Log
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Date:  6-23-2008
Number of Hours:  1.00
Manual Reference:  
Brief Description:  Rudder - Counter Balance Dimpling

To dimple the counter balance rib for a size 10 wood screw I used a wood screw counter sink. First I drilled the countersink shape into a hard piece of Oak wood and used it as the female dimple. Then I used the screw itself as the male dimple and I hit it with the rivet gun using the flush head. It pounded the dimple in the rib, just the right shape. Then I used the same wood countersink and drilled into the lead weight and made the countersink holes that will except the dimple. Worked just fine. Prior to this I did mess around with my dimples, and countersink bits from Avery's but none were the right shape. The wood countersink bit is available at hardware stores.
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Created the female dimple die in Oak

Created the female dimple die in Oak

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Used screw and hit it with rivet gun to dimple rib

Used screw and hit it with rivet gun to dimple rib

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Countsunk the lead weight

Countsunk the lead weight

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