I have a 5 or 6 year old front load Frigidaire washer.

After overloading the washer, it started to make a thumping noise and shaking in the spin cycle. In the other cycles it is very quiet. After this event, once, it washed a load without any sound, but then it started again and since then it is still making that terrible thumping noise. Only in the spin cycle, it makes about 3-5 thumps per second. I couldn't detect where the sound is comming from but it feels like the two drums are hitting each other. And the clothes looks like more wet.

I research the forum and follow some advices such as leveling the legs, pushing the weights and tightening the nuts. After that shaking is a little better but thumping is still there. Also pulley and belt seems fine (no sound without the belt). Struts and springs looks working. I checked inside of the drum to see something stuck between the two drums, but It is not possible to see anything.

A local service asked $50 to check it. Machine itself worths less than $200.

Is there any other thing that I can check to fix it by myself ?
or use local service or replace it ?

Any advice is appreciated. thanks.
ilker.