How do I thread a Kenmore model 158.19142 sewing machine. Picked it up at a second hand shop. I'm wondering if it is missing a few parts?

SOURCE: Kenmore Sewing Machine model # c877.15

I have an old Kenmore and here are the directions from my manual: 1. Draw thread from spool through bobbin winder tension discs. 2. Wind thread around an empty bobbin several times. 3. Place bobbin onto bobbin winder shaft with thread coming from rear of bobbin. Push bobbin winder latch against bobbin until it clicks. 4. Release clutch by turning clutch knob toward you. Start machine.

SOURCE: instructions for theading a Sears Kenmore Sewing machine model 158.14000

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.

To wind the bobbin, guide the thread around the thread guide on
the left top of your machine, then to the bobbin winder. Wind the thread around the bobbin several times, place the bobbin on top of the bobbin winder, push it against the wheel and press the foot pedal. It should stop winding when the bobbin is full or you take your foot off the control

Sewman7

SOURCE: need help to thread our sewing machine.

you really must get a manual for this machine.
You can find manuals online for a small price.
At one time some sites had them for free, but I haven't been able to find many recently. sewusa.com has some older ones for free. but not many. you could try the kenmore site as well, if not I'd try to search on dogpile.com (sewing machine manuals)
Just so you know, your manual is the MOST important tool for any sewing machine, and its worth a couple of bucks to get it.

SOURCE: Singer 457 Zig Zag Sewing Machine not catching bobbin thread.

There are manuals avilable online to purchase for the singer machines, SOrry I was not able to locate a site that has them for free.
.... http://sewingonline.co.uk/singer-manuals.html

SOURCE: Kenmore 385 model Automatic Button Hole Apparatus Jams Thread?

Practice and practice some more! Use the same fabric and interfacing as your project and a NEW needle (the correct needle) This is for the Sears Kenmore 385 automatic button hole maker. Make sure you pull the bobbin thread through the Guide Block - it is that simple. Make sure you pull your thread to the back of the machine though the presser foot slot - the correct presser foot. Account for both thread tails before starting to sew. Keep thread tails to the back of the machine 4-5", insert fabric under presser foot keeping thread tails clear. Mark button hole and sew.