Mickey2

Some become president of the US at ca. that age and have to sort out much worse ;- )

If you can access the setting screw for the gears and not too many parts need to be taken appart to get to it, it will not be as big a deal as it might sound. Some models are more cumbersome than others this way, others turn out to be a simple job.

If you are looking for stretchy stitch patterns (the red ones) you might as well do a bit more search on this model. Some of the 70s Singer models take "flexi cams", double layer which give the stretchy stitch. Some of them are better than others.

If you want the all metal construction go for a different model, a bit older than your 6110. The last all metal machines are generally dated to around 1960s (singer at least), but a lot of models had plastic gears by the early 1950s. There are a few models with stretch stitch patterns from the early 1950s , but there isn't many.

If you can accept simpler zigzag stitch patterns there are lots of nice models, but they usually need a lot of cleaning and oilling, a few replacement parts like belts and bobbin tires. I bougth a black cast iron straight stitcher (Singer 201) and have never regretted it. It has become a favorite, but I keep a freearm zigzagger on the side for fancy stitches and for jobs where the freearm is an advantage.