I didn't receive any instructions to do that, but then again none of the 6 steel blocks I've installed have the new enhanced "pop-in" model you got. Perhaps this may be a new requirement of the enhanced model.

I can't see how you could damage it by not having it installed while assembling it to your bridge. After all, it is just a steel block with some holes drilled in it.

I'll gladly trade you for the older style model which doesn’t have this requirement if you wish!

-trem

P.S. Would you please take a picture of the old and new block side by side so the rest of the members can see just how awesome these blocks are in comparison to the crappy MIM?