What is wrong with it?
They are usually quite simple. 'im indoors took mine (also Frister and Rossman) apart and gave it an oil etc and it was find afterwards...... but now it needs a little attention again as it has lost some tension. I keep wondering if I should buy another one - but I so dont sew enough anymore. Wish I did. But that would mean stopping work. (Then I could sew, cook, garden etc)and I'd be broked byut probably happier. . . . .
Try Peter Jones or John Lewis?