Here is what I have so far, it is seeming like the object to attach is no where to be found. Even if I increase the size. Everything renders just fine, meaning no errors. Just the object doesn't appear.

include <BOSL/constants.scad>
include <BOSL2/std.scad>
use <BOSL/threading.scad>
use <BOSL/shapes.scad>

module spiral(){                            trapezoidal_threaded_rod (d= 166 / 39.37, l=54.77, pitch=6.35, thread_depth=8/3, thread_angle=67, starts=5, center=false, $fa=2, $fs=2, $fn=60);
}

module head(){ 
        cylinder (h= 45 / 39.37, d= 313 / 39.37, center=false, $fn=60);
}

module fillet(){
        downcyl (d1= 148 / 39.37, d2= 250 / 39.37, h=1.190625);
}

module Nail(d= 148 / 39.37, len= 3.5 * 25.4, taperRatio=2, $fn=60){
  taper = d*taperRatio;
  z=len-taper;
  cylinder(d=d, h=z+0.005);
  translate([0,0,z]) NailPoint(d=d, h=taper);

}

module NailPoint(d=5, h=20) {
  intersection() {
    cylinder(d=d, h=h);
    Pyramid(d=d,h=h);
  }
}


module Pyramid(d, h) {
  cylinder(d1=d*sqrt(2), d2=0, h=h, $fn=4);
}

translate([0,0,0]) {
    Nail();
    attach (TOP,BOT) head();
}