factory vs spiro locks vs Kramm Lox piston pin retainers

[Harpo]

Good afternoon everyone,

Can our resident experts cover the pro & cons of the following piston pin retainers

1) factory piston pin retainers
2) Spiro lock
3) Kramm Lox

Thanks

David

[Harpo]

Kramm lox
https://www.youtube.com/watch?v=39P36BmXniU

Spiro lock
https://www.youtube.com/watch?v=NB2t3b29beE

[JoeMag]

Thanks for sharing the different parts. I’ve used the factory ones on my mahle 3.8’s with stomski’s instertion tool. It works great. But I do not like popping them out and them flying.

Seeing the Kramm lock video, I like those and the little tool.

Spiro lock looks like a pia.

[stownsen914]

There was another thread recently describing how different styles of locks may not necessarily be interchangeable. Perhaps it's just a matter of ensuring correct dimensions, but worth confirming.