If you can find a local stockist I would look into trying to get hold of some postsavers, should reduce the speed that your posts rot out.
A few of the local timber merchants round here stock them.
Or concrete spur, bit more industrial and possibly unsightly, but makes replacement a doddle.
-edit- just reread, rounded posts, crack on with the post savers!
@small started
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If you can find a local stockist I would look into trying to get hold of some postsavers, should reduce the speed that your posts rot out.
A few of the local timber merchants round here stock them.