[gfirob]

I just bought a pair of these based on all the reviews on line, but I did find out that Patagonia will sell you the entire system -- bars, threaded inserts and bolts -- as replacements, for both boots for $29. They have very detailed instructions on line as a pdf. The problem I saw in checking this out is that the Patagonia boot is entirely flat-soled under the aluminium, but any lugged boot is going to have spaces under some of the bolt holes, and I wasn't sure how much of a problem that might be. So I bit the bullet and bought the new boots. Have not received them yet.