The problem has always existed with the machine when trying to do 4 thread sewing. The twin needle pops frequently, causing you to have to replace. This is very costly. I would like to be able to use two separate serger needles instead. I have been told that a replacement part is available for around $160.00. I don't know if technology this old is worth it. Can you help?

Sewing Machines - Elna - 1010