I have been using M401 402 and 403 for about 2 months.
I prefer 401 over 510 mainly because of the smaller size and weight.
The 401 does have a harder draw and it can get tiring.
I cut end of cart off to tail pipe direct drip; still the draw is hard.
The only thing I have found to improve the draw is to drill a 1/32" hole in the cart about 7/16" from atty sholder.
Hard draw is not a function of the batt since draw is hard with battery detached.
Looks like the M401 needs to be modified at the factory for easier draw.
Hmmm...I just got a new M401 atty out of storage and the draw of the new atty is much easier than the 2 month old atty...looks like the old atty is ready for a good bath.
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