Thank you for your reply and good luck with the kit.

Here is a link to the Model 39 adapter post.

M39-2 conversion kit conundrum

I am still confused at what prevents the firing pin from striking the 22lr round dead center as it does in the 357/38 round if the inserts are not offset.

Cheers

First I like to clarify that it is NOT my set!
I have no gun to fit it to...

Although not shown as a seperate part in tne photo, there are small inserts with an eccentric protrusion you place behind the .22lr cartridge.

In the catalog, downloadable as pdf, there is an example on another cartridge conversion.
See leftside of the page on the link you gave us.
(thanks for that BTW!)

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anton