Unless its an air bleed carb.

This process also presupposes that its not a glow plug going bad or a hole in the fuel line hence my first question of why adjust it in the first place. If the engine was running fine, and then started giving trouble, first suspect is always the glow plug, then the fuel lines, then the tuning, in that order. Trying to tune the low end with a bad glow plug or air leak in the lines will only lead to frustration.

1/4 turn is much to large and adjustment on the low end, particularly if your getting close. 1/8 turn or less should be the rule. Otherwise, you'll miss the sweet spot.

Brad