Step 1: Removing the Factory Gear Knob
Once it is removed you can start to get an idea of the size of the holes you will need to drill in you new knob.
I measured the width and depth of the holes. I decided to keep hold of the factory gear knob just in case I want to sell my van at some point.
Next I worked out what sort of angle I wanted the skull to be positioned at.
Step 2: Planning the Hole
You will also need to measure the depth of your chosen object to make sure you're not going to accidentally drill right through it.
I have chosen a Nemesis Now Resin Skull (Azurite Skull) Here is a website which sells various colours and sizes...
I don't own a vice so I drilled a hole in a small section of wood then popped some blu-tac in it. This acts as a support to help you accurately drill the hole.
Step 3: Drilling
The flat bit will give you a nice starting point for the smaller drill bit. Use a regular HSS bit to make the smaller hole otherwise it might pop out of the top of the skull. Go slowly to avoid drilling right through.
Neaten up the edges with a small needle file or sand paper.
Step 4: Finishing the Cavity
I decided that the cavity was a little bit to visible from the outside of the skull so I neatened it up by applying a thin coat of Epoxy Resin. you could also fix any mistakes or scratches with the same method. It dries totally clear although this will only be necessary if you are using a transparent object.
You can see how much neater it looks in the last photo.
Step 5: Fitting
As you can see the reverse collar moves smoothly into the cavity at the base of the skull.
Obviously you can use this method for all manor of objects. Pool or Billiard balls are another popular choice.