Hmmmm...Ken's 'kit' is for .22 shorts [Model 151] while Gerben's is for .22 LR [Model 1-70]. The cartridge adapters are not the same.
Ken's Model 151 also has an extended portion with what look like soot-marked holes in it...
I'm getting an idea of how the .22 LR cartridge adapter works...Unfortunately, it's 'micro-machining', which is pretty much beyond my skill/tool level...
Edit: Found a couple threads over on WaltherForums detailing the .22 & .177/sub-caliber adapters and the trials of members there dealing with the eBay seller...
http://www.waltherforums.com/forum/p...el-pp-ppk.html
http://www.waltherforums.com/forum/p...rsion-set.html
http://www.waltherforums.com/forum/p...t-however.html