Maybe it would be better to just retap the Z-stick rather than the head?
Tap to a smaller size and use a reducer bushing (large OD of bushing fits
head, smaller ID fits Z-stick). Just a thought....IMHO it's better to modify
an easily replaceable part than modify a part of the van.
Mark

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>> FYI - Just got confirmed by Fast German auto that the Z-sticks are 1/8"
>> pipe thread which require retaping the threads in the head in order for
>> them to fit. They are not a 'drop-in' replacement.
>