Something seems to be wrong with the "nut" parameter.
I set line 6 to these values:
```
module clamp(d=14.5,wall=2,h=30,gapAngle=10,gapWallAngle=25,padLength=20,padWall=[7,7],bolt=4,boltPad=4,boltHead=7.5,nut=6.8,nutPad=4,boltShift=[5,0,0],padGap=0,f=[1,5],chamfer=45){
```
Despite being set to 6.8 (for a M4 nut) the hexagonal hole came out to have a size of 5.889mm (see attached screenshot)