This is the final version of the Arntz / Butler door. The inner and outer fibreglass panels conceal a 2 x 4 x 0.120 wall steel tube for crash protection and rigidity. A VW door latch, striker and handle let you in and out. A plate is welded on the front, to which the hinges bolt and adjust. The hinges are press formed from 1.5 x 0.5 solid steel bar and swing on delrin bushes. Unique to the Arntz Type 4 are the Mercedes door pin and socket (just above the latch) that solidly ties the door to the rest of the cage surrounding the passenger compartment.
