Sanding block (M3 heat set inserts)

There are 2 versions:largeabout 12.5 cm (~5 inches) longYou will need:2x M3 short (4mm) heat set inserts2x M3x(9-12) socket head bolts (length: 9-12mm)instructions: see image smallsmall: about 10 cm (~4 inches) long, also less wideYou will need:2x M3 short (4mm) heat set inserts2x M3x(6-9) socket head bolts ( length: 6-9mm)instructions: see image protip:use the plate technique to insert the heat set inserts: don't fully put the insert in but leave a small part sticking outWhile the insert is still hot, use a flat piece of a heat resistant material to push the insert fully in This ensures that the insert is perpendicular and that it is perfectly flush with the surface.