I have a Sieg C3 ("mini lathe", 7" x 14"), which I think is similar to the machine in question. Have a look at the carriage/saddle gibs, the standard ones are pretty tacky and hard to adjust adequately. I changed mine to tapered gibs and the difference is surprising, much, much better. I used Bogstandards method, which may still be available here. There are lots of other guides though. Well worth the effort.
cheers
Bill