Here is a link previously posted by forum member JKing who was very helpful to me when I rebuilt an Air Venturi earlier this year. Bigragu also has a thread on rebuilding a Tuxing compressor which is very similar to the Air Venturi.
https://www.airgunnation.com/members/jking/forums/replies/page/21/#post-630387
https://www.airgunnation.com/members/jking/forums/replies/page/21/#post-630387
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