rg627,
+1 on Shauny's take down pin.
The VMach pin uses a very small screw to secure, and there have been reports that these are sometimes very difficult to remove if the user was 'enthusiastic' when installing.
Shauny's pins are 300 series stainless, and use a single circlip to secure and I highly recommended them.
(My three (3) HW break barrel's all have Shauny pins.)
Have fun & a good Sunday
Best regards
Russ