There is a manual pdf down load from manualslib.com that explains where the thread tensioner is and how to adjust page 17 of 46 pages it shows how to thread the machine correctly the tensioner is a wheel at the top of the machine that turns 0- 6 notches to the left or 0- 6 notches to the right ( 12 possible tensions) download the manual( free) as it explains probably better than the user manual it is for your machine I found it by going google and typing in--how to adjust thread tension on a janome memory craft 3500 and found that manualslib site
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There is a manual pdf down load from manualslib.com that explains where the thread tensioner is and how to adjust page 17 of 46 pages
it shows how to thread the machine correctly
the tensioner is a wheel at the top of the machine that turns 0- 6 notches to the left or 0- 6 notches to the right ( 12 possible tensions)
download the manual( free) as it explains probably better than the user manual
it is for your machine
I found it by going google and typing in--how to adjust thread tension on a janome memory craft 3500 and found that manualslib site