In message om, FMurtz
writes
Bill Wright wrote:

The posts vary a bit. I think they make the spikes a bit small to suit
all sizes.

???

Having used met posts, I think Bill is right. Not all fence posts are
created equal, and a bundle of posts, each nominally, say, 4 x 4, will
not be exactly the same. Close enough, but even a difference of 1/8th
of an inch is the difference between a post slipping easily into the
foot, or not. You would think the foot hole would be large enough to
accept slightly oversized posts, with the smaller ones being held by
adjustment, but apparently not.
--
Graeme