Method for creating a precast concrete wall with adjustable concrete form liner connection

An adjustable liner comprising:

• a front face;
• a back face;
• a periphery formed from:
• a first end;
• a second end;
• a first side;
• a second side;
• two or more insets formed in the adjustable liner from the first end to the second end, wherein the two or more insets are formed by two or more first protrusions formed through the back face and into the front face and protrude outward from the front face, wherein the two or more insets hold a building material, and wherein the two or more insets are arranged to form a decorative course for the building material;
• and
• a second protrusion formed through the back face and into the front face proximate to the first side to mate with a continuous protrusion formed at a side of a second liner, wherein the second liner forms a field of building material, and wherein the adjustable liner is adjusted, with respect to the second liner, by inserting the second protrusion into a rear of the continuous protrusion and then sliding the adjustable liner along an axis parallel with the side of the second liner, the second protrusion comprising a gap between the second protrusion and at least one of the two or more insets, the gap allowing the adjustable liner to slide within the continuous protrusion without the continuous protrusion contacting the one of the two or more insets.