what do you use to make your stitching line

[Tugadude]

Wing dividers for really thin leather.  On other projects I've used creasers and groovers.  If you don't use too much pressure a groover makes a scratch, not a groove.

If you want recessed stitching use a groover and remove leather.  Just making a dent is no good because the leather will expand eventually, eliminating the recess.

[bcraig]

Thanks to all for your input