Large ring mauser bolt lug lapper

thingiverse

This is a custom tool for lapping locking lug recesses in large ring Mauser bolts, designed for use with a 3D printed spring and adjustable tension. I utilized a 3/8-inch spring that's 1-1/4 inches long, paired with a half-inch bolt that's also 1/2 inch long to fine-tune the spring's tension. For users without access to imperial hardware, a 3D printable bolt has been included for easy assembly. Post-printing cleanup of the internal thread may be necessary using a tap, and the printable bolt can be scaled along its x and y axes to achieve a looser fit as needed.