Tighten the pinch screw. Be sure stop screw is in place, Otherwise timing will be off.

Sewing Machine Maintenance Needle Faces Where?
I Need to Tighten the Tension....
Changing a Needle
Need Help
Basic Questions-
Bobbin Assembly Popped Out!
Do You Think My Machine is Fixable?
How to Change a Broken Needle
Needle Bar Adjustment
Oiling an Elna 3007
Getting the Timing Belt Off?
What Size Needles for My Machine?
How to Oil my Machine?
Where to Oil??
Stitch Length Knob Woes
Can't Seem to Put the Bobbin in Correctly
Timing Belt Tension
Adjustments
Running Very Slow-
Oiling Points on Singer 257
Oiling My Singer Touch & Sew
Singer 457
Featherweight Case Odor
Brother XL2010 Q's
Does My Machine Have More Than One Belt?
Cannot Seem To Adjust the Tension
What to Do About a Gumming Up Needle
How Tighten My Bobbin Tension, Please
Is it Covered Under Warranty?
Proper Threading Instructions?
Just a Foot Pedal?
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Threading a Singer 600
Replacing a Blade on a Johnson Ruffler
Changing the Needle
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Thread Balling Underneath
Warranty Info
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Spindle Stuck?
Do Motors Die?
Singer 457
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Servicing My Machine-
Belt Replacement
Lubricating My Sewing Machine

Hope this may help;

Regards,
Votit

Hi JOrgeGIr,

Please click the below mentioned link to know how to time the hook:
http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Hook%20Timing.htm
(here there are four diagrams given, click on a diagram to enlarge it)

To see more problems associated with consew 210 , please click the link given below:
http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Troubleshooting.htm
(here there are full list of problems with their causes and solution)

Thanks

Dear Sir/madam,

A sewing machine operator can often help themselves when their machine does not operate properly.
Here are some simple instructions, which if properly used can save time and mechanics service calls.
TROUBLE;UPPER THREAD KEEPS BREAKING;
This could be trouble;================Do this;
1.Top tension to tight================loosen tension 1 turn
2.Machine improperly threaded=========check threading
3.Thread twisted on guide post========"
4.Thread twisted out of tension======="
5.Take up spring bent or broken=======Check action of spring
6.Thread jumped off pull off finger===Check threading
7.Needle bent or burred===============new needle
8.Bad cone of thread==================try another cone
TROUBLE;LOWER THREAD KEEPS BREAKING;
1.Bobbin tensionspring to tight=======Loosen tension slightly
2.Bobbin threaded wrong===============check threading
3.Bobbin wound to tight or uneven=====try new bobbin
4.lint or thread on bobbin case=======clean inside case
5.Lint or thread inside hook==========clean inside hook
6.Bobbin case nicked bent or burred===check/change case
TROUBLE;MACHINE STARTED SKIPPING STITCHES;
1.Needle bent or burred===============change
2.Needle set in crooked===============Check
3.Thread jumped off take up spring====check threading
4.Thread jumped off pull off finger===check threading
TROUBLE STITCHES SHOWING LOOPS;
1.Forming loops on top of cloth=======Tighten bobbin tension
======================================or loosen top tension.
2.forming loops on bottom of cloth====Tighten top tension
3.Bobbin placed in case incorrectly===remove and replace
4.Bobbin thread slipped from under====check threading of
tension===============================bobbin case
5.Lint or thread in top tension=======clean between tension discs


thanks
good luck

What Brand sewing machine you got and model

I am not sure about this particular machine but in most machines there will be a nob on the front loose low numbers like 0 1 -2 work well on number 3. If the nob is not on the front check and see if it is on the side.

U need to go with a professionl service man