A hot glue gun
Hot Glue Sticks
Fragile Tape (Packaging Tape)
Something to stand your darts up in.
For starters use a mitre box to cut your foam into lengths between 1.5" and 2.5". I recommend using 2.0" inch as this is the average and provides best performance.
After you have completed your cuts, grab your hairdryer and pop your blank cuts into a bucket with something to cover 80% so the bullets don't fly out while hair drying. Start hair drying your darts until they change colour slightly or straighten. This varies from foam to foam, my foam usuually takes about one minute. Make sure when you are hair drying them that you don't focus on the one spot move it around lots to ensure even distribution of heat.
Next step is to grab your trusty hot glue gun. I find the best ones are the cheapy one's from Crazy Clarks, The Warehouse, Dollar's & Sense etc.
Let your gun heat up. Put a hole with the tip of your gun into the centre of the foam as shown below.
Next drop your weight into the hole.
Next use your glue gun to create a nice dome over the hole. Be patient with this step and don't rush it, or the dome's don't shape nicely. Try to keep your gun in the centre and if you have problems with glue stringing, gentle move around in a circular motion around the dome until the glue comes off the gun.
Stand your darts up in some PVC or PETG or other material.
You now have finished darts, but if you want to create zero darts read on.
Grab some packing tape or fragile tape. DO NOT USE ETAPE as this is rough and hurts the performance of the dart. Smooth lightweight tape is the best. Cut it down to the correct size I use just enough to make a complete layer around my dart. I only cover 50-70% of the dart with tape, sometimes I do batches with 25% of the length of the dart.
Once again using a mitrebox increases dart quality.
Carefully wrap the tape around the bullet evenly. DO NOT allow excess tape on the front of the dart. make sure your tap only covers foam, not thin air.
The Finished product.