Intermitent spin?

I think my 1000 rpm indesit motor is gone.

Fullish load speed intermitent, gradually getting worse, cloths really wet now.
Last motor sparked when brushes were needing repalced.

This is the second motor which I had to alter the wiring in the multiplug slightly if i remember correctly.

Is the brushes an easy job to do, reluctant to scrap it.

Machine is 10 years plus with no problems apart from the motor issue.

Any guidance and responses appreciated.