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What's the difference between the formula secondary and the HPV 27, other than ramps on both sides on the HPV 27?
 

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formula driven has a smaller diameter helix and also comes w/ a wind up spring that you put preload into, hpv 27 has a compression spring w/ a low torque sled like a 500 or pre ho 600 that comp. spring seems to be fine, the 700 and 800 sack out the spring and it becomes ineffective, when I reclutch them I convert the hpv 27 to the wind up spring, otherwise that big helix works good because of the larger bearing surface area
 
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