paul womack
>The important principle here is NOT scraping; it's the use a reference (surface plate) to guide the metal removal process.

If the error is large, metal removal can be done with fairly brutal methods.

I have had good results using small wooden block with SiC paper for the needed localised metal removal.

Note also (on my page) the reference to what's involved (S & S) in getting so-called-lapping to actually work properly.

BugBear