For inexperienced users, you should avoid taking the head apart unless you absolutely have to. The tolerances for the spacer/TFM/block are pretty important to make sure it performs the way it should. Ultimaker uses a little spacer when they tighten down the package to make sure every unit has the "exact" (that's a dangerous word ) same tension.
Before you ask, I don't have the spacer, I've asked for it several times as it's kinda important when your job is working on Ultimakers... but haven't gotten one yet. I've used a set of callipers to measure the distance between the two plates when re-tightening (I don't remember the distance off hand).
I have no idea what would be a normal tolerance, but with 3,7% off it seems it should be possible to get it better. On the other hand Ultimaker worked a long time on this feeder so I somehow think the steps value should be ok....
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