How do you measure the "fork" for this style lock?

Question

Hello,

I recently purchased and received a Roto Multi-Point Lock, 37MM Fork window lock. However, it's smaller than the broken part I am trying to replace. I incorrectl measured the fork from the metal housing rather than just the fork.

Can I return and exchange the part? If so, do you stock any latches with forks that are longer than 37mm's? all other dimensions and sizing match the part i am trying to replace.

Attached are images showing my existing, broken latch and the 37mm fork.
Thanks.
Best regards,
Andy

Tom · Accepted Answer

Hey, Andy! To measure this kind of lock, you don't just measure the fork itself. Rather you measure what I call the "projection;" this is the distance from the tip of the fork to the lip on the bottom of the base.

I know that might sound unclear, so hopefully the diagram is a little more clear for you. I'll use the 38-139 as an example. Can you tell me what this measurement is on your original part?

Alternate view of 38-139