Graco Caster Alignment --

The front caster can be adjusted using the following procedure. The adjustment clamp bolt is on the bottom of the caster (see arrow on picture below) Procedure for checking and adjusting alignment: First, make sure that all tires have the proper inflation and check to see if they are rotating freely. Grease front caster or repack rear bearings if necessary. Then follow the procedure below: 1) Find a flat surface and chalk a 100' line. 2) Line your striper up with the chalkine and push it using the center of the handlebars using one hand. 3) Note whether it tracks right or left. 4) Using a hammer and sharp chisel, make a sharp line vertically across the clamp plate and the caster plate (like the small black line on diagram). This will give you a visual reference for adjustments. 5) Loosen clamp bolt slightly and make a tiny adjustment to straighten caster. Tighten bolt. 6) Test tracking and make adjustments to get tracking as true as possible. 7) Tighten adjustment clamp bolt securely.

or..........................rap said caster wheell with rubber hammer!!!!.....................works for me!!!