If the machine is correctly threaded this could be caused by incorrect installation of the left needle, if not full inserted it can cause the machine to drop the stitch, just loosen the needle and push it up into the holder.
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The hobbylocks all thread in much the same fashion. There is a diagram for a four thread hobbylock on this website. It would be better if you found a Pfaff dealer to show you as it is quite complicated.
Once you have it threaded, always cut the old threads at the spool and knot new ones on and pull through. You will have to thread the needles as the knots will not pass through but it does save an awful lot of frustration when needing new colours on the spools.
You would pull out several long lengths of matching thread from my spool of thread and knot the threads together at one end (to hold them together). Grab the knotted end of threads with your left hand and place the threads(held taunt together) under the presserfoot of your sewing machine.
Select a narrow zigzag stitch that will zigzag over the threads, and holding both the knotted end(Left hand) and the other ends with right hand( holding tauntly), zigzag down the length of the threads.
You can use this for matching button loops, cording for belt loops, or whenever you need matching cord. The thickness of the cord will depend on how many strands of thread you want to use. You insert the loop of cord into the seam, so that when the garment is turned RIGHT SIDE OUT, the loop will be sticking out of the seam and you can put the button through the loop.
Start with brand new needles. Make sure you use sharp needles for woven and ball point for knits.
Remove all threads from machine. Open all covers,, including top cover (under thread tension). Remove all lint. Oil moving parts. Replace covers.
Thread your machine from right to left. In other words, start with the lower looper, upper looper, right needle, then left needle. That should solve your problem. Thread must be threaded in specific order and through every loop in order to work. One miss threaded loop will cause the machine not to sew properly.
Here is the trick: If you look at your thread spools, left to right, thread machine beginning with thread from spool 3, then 4, then 1, then 2.
Thread 4 is tricky. You must line up the purple line on the big wheel on the right end in order to do this. Thread the machine according to the diagram on the inside, then, making sure you lined up the purple line, push the lever at the bottom of the machine (below threading guides) to the left while holding on to the thread end. This will push the thread up and along the horizontal arm you just threaded.
thread this machine by taking a strain of thread from the spool pull it to the thread guide on top left side of machine criss cross the thread when you wrap it around the thread guide pull thread down and loop it under the needle thread tension control dial bring thread up and loop it on the thread take up lever, continue down to the needle looping it first around the metal piece above it then through the needle it self pull thread to back of sewing manchine with the bobbin thread