Measuring length for S600

A quick learner from NJ says:
I measured the length of the balance spring tube from end to just before the blue color tip and it's 28.25". See attached photo. The sash weighs 22.5 lbs and the tube is 5/8". Should I order a 28" or 29" tube?

Also do I have to order the charging tool or can I do by hand?

User submitted a photo of a spiral balance.
Profile picture of Paul
Paul from SWISCO responded:
Hey, Lauren. I recommend going with the 29" balance in this case. I highly recommend using the charging tool, as it makes charging the balance infinitely easier. You can see how by viewing the video below.
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