You can purchase a copy of the Necchi 537L manual as either a PDF download or a printed manual here: https://www.sewingpartsonline.com/instruction-manual-necchi-537-l.aspx? . There are several online guides for threading Necchi machines. These may help. However I don't know how different the leather and lace 537 is from other Necchi machines. The manual will have the threading diagrams.
I hope this helps .
Cindy Wells
SOURCE: I need to know how
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all machines thread the same. TTN tension, take up,
needle.
Beginning with the spool, guide the
thread through the thread guides to the tension assembly. Pull the thread
through the tension assembly and test it to make sure the tension is working
correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.) If it passes this test, continue up through the
take up lever,then down through the thread guides to the needle. Make sure your
needle is fully inserted and turned the correct way.( If you load your bobbin
case from the left side,the needle rule is normally FLAT to the RIGHT is RIGHT.
There are some exceptions. If you have a newer style drop in bobbin or your
bobbin case loads in the front then the rule is FLAT to the BACK.
sewman7
SOURCE: how to thread necchi 537L sewing machine
From the reel pin take the thread to the left and over the top thread guide above the takeup lever, make sure the takeup lever is up and and make sure the presser foot is up, take the thread straight down and round the right hand side of the tension unit and back up the left hand side to the takeup lever, thread the takeup lever right to left and take the thread down any guides to the needle, if the bobbin case goes in the front thread the needle front to back, if the bobbin case goes in the side thread the needle left to right.
SOURCE: How do you thread a Necchi Model 537L sewing
Although your model may not be listed exactly, this link ought to provide other models similar enough to yours to be of assistance.
HERE
SOURCE: Threading a necchi 537l
There are several Necchi models (and loads more) threading guides shown here, it may well be you can find one very similar to help.
Threading Guides
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