My spektra halos both work perfectly. I love everything about them. I use one for lining and one for shading.
I purchased my first one directly from fkirons. Awesome customer service, quick and easy to deal with.
I purchased my second one from a distributor World Famous, they are local to me so I was able to save on shipping.

Anyways, I have reached that time to clean and lube my machines. NOTHING BROKEN but this is what I found:

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As you can see one spring is a lot shorter then the other. I have read on the forums that some halo users do cut their springs to change their "give".
Now the one directly from Fkirons is the longer spring. So I know that obviously that is "stock". I have used the one with the shorter spring from their local distributors
for lining WITHOUT ANY ISSUES AT ALL.....
I use a critical cx2-r power supply
Here are the ways I run them:
the short spring machine 9v 2 and half turns out from (tighter to looser) usually a 7rl and lines like a laser.
the stock "long spring" 7.5v 1 turn +/- usually 7mag - 15mag packs and blends amazing.

My questions are:
Short spring have any bad effects down the road on the machine?
Those of you who have modified the spring notice any better performance?
any input /answers please

sorry mods if I placed this in wrong section.