I would like to learn more about the "heavy duty" L19 leaf. I've not seen one yet.
Del, in cross referencing Univair's part numbers with TM55-1510-202-35P, the 170IPC, and the emails from Univair, the so called "heavy duty" L-19 leaf set(listed as L19TWS), is simply Univair's nomenclature for the L-19 spring set, which is nearly identical to the Cessna 170(A/B) leaf Sets, except for the main leaf. The top three springs are reportedly identical(disregarding the early models' fifth spring), but the main leaf for the L-19 is 1/16" thicker (I know you read this earlier, I'm just summing up my thoughts).
The misleading information, which I referred to earlier in the thread, is that while Univair lists the L-19 as exclusively applicable to the L-19 (because of the larger main spring), they list the 0642101 CESSNA MAIN LEAF SPRING by itself as applicable to both the 170 & the L-19,
even though it does not match the 170 P/N, and is in fact has no PMA/FAA approval for either the L-19 or the 170.
Regarding Bruce's post earlier in the thread about how many owners may unknowingly have the L-19 spring installed, I would guess this is a contributing factor.
First time aircraft owner: '26C A gleaming Cessna 170B with 180 horsepower: the perfect mechanical bird.