All the complicated vacuum control on the distributor equipped in '71 VW Super Beetle were killed and the result was incredibly excellent. Combustion firing timing at idle speed was set at BTDC 5 degree as a matter of fact. BTDC 5 degree is the most favorable idle speed advanced position to attain comfortable accelerating at middle speed.
All the advancing effect were done without vacuum advancer, only by mechanical centrifugal advancing construction.
Once the information that no vacuum advancing device is required, diaphragm construction for advancing control should be eliminated also nipples for the signals on the carburetor are closed.
I just remembered that I got 009 distributor tens year ago! Now have I no reason not to appear stage if it has no diaphragm vacuum advancer. Some information tells that mechanical signal coupling delayed 90 degree, so hi-tension cord connection must be changed.
Anyway, smooth transition while acceleration phase is the first requirement, it' a interesting task for tomorrow. Super Beetle never betray to keep a geriatric enthusiast.