Anyone any idea how much it costs to get a sewing machine serviced/repaired...the bottom thread wasn't 'catching'' the top thread, so I unscrewed a couple of bits around the bobbin-y bit under the needle plate etc to see if there was an obvious problem...there is now!!!! I can't put it back together...I'm sure it is just a 'knack' that I don't have...
so..what sort of money are we talking about?