As first seen here: http://www.thedentedhelmet.com/showthread.php?t=29147
You can now order your accurate jet pack Adjustment Knob here at the Rebelscum store.
ORDER HERE DIRECTLY: http://stage.rebelscum.com/estore/products.asp?cat=176
This piece is based/ measured off the original found part adustment knob used on the real pack, and has the correct "crosshatch" / Knurling.
Paypal only. 35$ Shipped. and 40$ International.
Please PM me for any addtional Questions.