Helo Declan!
For the fingerjab target, you first bolt a 2" x 4" to the wall (as long as you need it to be based on how many bags you are hanging) at the height of where you want the bolts at the top of your bag to be. The striking surface of the bag should be about face height. Then fill the bag to your liking with dried beans, etc. and bolt it to the 2' x 4". It is best to measure and pre-drill the holes. If the bag is not overly full, this allows a little bit of play between the bag and the wall, allowing you to safely practice the perfect degree of penetration for the bil jee.

Keep Blasting!
Sifu Lamar M. Davis II
Senior Instructor
Hardcore Jeet Kune Do
sifu@live.com
http://www.HardcoreJKD.com
http://www.DragonBlastMA.com
Phone (205) 296-7070 (Incoming Only)
or (205) 213-2086
"Hit Hard, Hit Fast, Hit First - ALWAYS!"
"The REAL future of Jeet Kune Do belongs to US, the few, the proud, the HARDCORE! Now, what are we going to do with it?" _ Sifu Lamar M. Davis II