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I put a trim tab on my left elevator operated from a lever
on the console. I used 0.062" SS solid wire (ACS) through the bicycle cable
conduit rather than the much heavier and stiffer Bowden cable. 'Works just fine,
and gives a much better speed-sensitive trim than the Lancair spring trim; I've
flown with both. Spring trim balances a force or longitudinal unbalance and
is not speed sensitive. A trim tab supplies a force proportional to V^2, so
reacts better to maintain trim speed with longitudinal unbalance, such as with
burning off fuel. Both require some trim change over time, just less with a
tab.
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