Things you need
1. Punch stitching holes
Draw a guide line to follow with the diamond chisel.
Follow the guide line with diamond chisel and hammer the holes.
Hammer deep enough that you cen see the tips of the chisel is about 1mm out.
2. Prepare thread and needles
The way I measure thread is x2 the length of the actual stitching distance plus extra 5cm or so.
This is usually pretty accurate.
This specific knot will lock the thread in place and will not come off during saddle stitching.
3. Start stitching
Attach a needle on both ends of the thread.
Start with putting 2 needles through from the front.
Be careful not to sew through the thread.
4. Finish stitching
To finish saddle stitching you need to keep the loop instead of pulling all the way.
Do both ends and you should end up like this.
Put the needle through the loop
You shoud get a loop like this.
Apply small amount of glue.
Then pull tight.
Trim thread about 5mm and melt the tip with lighter.
Press down to seal.