Why use hammer on full floating rod inseerts?

[40 Deluxe]

Ever wonder why we are told to use a soft hammer to 'adjust' full floating rod bearings? This paper I found in a NOS rod box may explain. (If I can get the photos to post).

Oops. Try again!

Well, can't get the pictures to post, so here's what the paper said: "NOTICE Because of the special alloys used in these full-floating bearings, changes in temperature may cause them to spread at the part lines.
If they have spread, they will bind in the rod. To close the bearings, simply tap them lightly with a rubber or wooden mallet.

DETROIT ALUMINUM & BRASS CORPORATION service division"

So there we have it; straight from the horse's mouth!