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Re: New Home LOCK 778
Any sewing machine store should have or be able to obtain these blades for you. You should only need one because one of them is a carbide steel blade(Very Hard). It will have a dark color on the cutting part of the blade.Replace the other one. sewman7
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You may be able to find a replacement blade. Search the internet for:
Make + Model + the word "blade"
or contact manufacturer support.
Most of the time, only one blade can be replaced by a lay person. The other blade requires some technical skill (to assure accurate placement and timing), so you will most likely need to take it for service. Consult your owner's manual.
You don't specify the make/model - it is always best to obtain a manual for you rmachine to ensure that you are oiling in the necessary spots to ensure longevity.
Generally though, you would open up the front flap/s of your overlocker and brush out around the lower loopers and blades to remove all the lint build up before starting a new project. Then add a drop of oil to any of the metal on metal moving parts in this area. The blades also benefit from a small drop of oil.
Try sewusa.com for sewing machine and overlocker manuals.
Be sure the blades are "raised" properly - did you have them lowered so you could sew without cutting? Maybe they are not locked back in place. Is the machine set for rolled hem? Re-set it for regular overlocking. Even if the blades were blunt, you should still be getting some sort of cutting happening. Blades are reasonably easy to replace yourself but getting hold of replacement blades can be tricky.