If you have not done so already, have a look at the user guide.
Not sure if you are getting the problems while stitching leather or you are yet to do that.

Leather is a thicker material and you may require some adjustments on your machine to allow for this. see page 13.
Keeping the machine well oiled is also useful.

If you don't have the user guide it is available at

http://consew.marginspluslive.com/images/products/pdf4/206rb5instr.pdf

Please do post a comment on how you went with this. Happy flying.

Hi there,

Well, the most likely cause for you machine to skip stitches is the machine needle. If your machine was sewing fine and suddenly decides to skip stitches, change your sewing machine needle.
If you find yourself changing the needle often, be sure you are allowing the feed dog to feed the fabric through the machine and that you are not forcing the fabric which can lead to bent needles. Even slightly forcing the fabric can bend the machine needle. Let the feed dog do the work.

Please check all the following steps -

- Needle not correctly inserted in the needle bar
- Needle too small for the thread used
- Needle too short for the machine
- Blunt or bent needle
- If zipper foot is used, the edge of the foot is too far away from the needle.
- Needle threaded incorrectly
- Needle hole in throat plate too large
- Pressure too light
- Upper tension too tight
- Upper thread and bobbin thread of different size and /or type

Good Luck!!

Thanks