John...if you send Lena, you can forget anything pertaining to 1911 pistols from me for about a year.
Going a little further...now that I have my brain cleared...The advertised link
on-center dimensions are nominal, and have a tolerance of +/- .0005 inch, which means that with two given links, there can be a maximum difference of .001 inch. Also, other brands besides Wilson are offered in .003 increments that will allow you to find one that will effect an exact fit most of the time. The downside is that you'll either have to keep a large inventory on hand...or determine exactly what you need and order...and even those have that +/- tolerance...so be prepared to adjust the link slightly by elongating the large hole in one end or the other.
Opening the top of the hole...closest to the lug...doesn't change linkdown timing. Opening it in the lower half delays it in the same way as a longer link.
Generally speaking...if it needs to be opened in the lower end, I much prefer to step up to a longer one, unless the amount needed is .002 inch or less... and I try to limit opening the top to a maximum of about .003 inch, though .005 or more isn't out of the question...IF...the link correctly times the barrel. As a rule, if it needs to be adjusted more than .003 inch, you probably either need a shorter link, or the lower lug dimension is wrong for correct vertical lug engagement. Opening the top doesn't really have a negative downside since it neither changes barrel timing, nor does that area of the link come under any tensile stresses.
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