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The way I've been reading this thread was that gemming was the most inferior form of inner sole attachment, even more so than in cemented soles. I'm not sure if DWFII was also implying that it was also the most inferior form of shoe construction as a whole.
One of the most crucial points I've made...and one that has been missed...is that despite the perhaps testimonials to the GY welt, it's prelude to further degradation of the shoe in a way that few other techniques are. Forgive me for repeating myself but...
Now, it bears repeating...in almost all instances, the gemming is held in place solely by cement. And that is its first weak spot. The cement will fail, probably even before the shoe is in need of a resole. When the cement fails the gemming slips and the shoe will walk out of shape. And anyone attempting to resole without the original last, faces the nearly impossible task of trying to re-position the gemming. Moreover, canvas is far more fragile than leather. If cotton canvas is used, it is subject to bacterial action--rot, in other words. Stitches pull through, the welt itself comes loose, and moisture and dirt enter the shoe. Gemming also frees the manufacturer to select thinner and cheaper grades of leather for the insole...or eschew leather altogether and use fiberboard insoles. Nothing visible, nothing immediately apparent will alert the customer to this further debasement of sound shoe technologies. Many manufacturers put a Poron or other cushion insole on top of the fiberboard insole and tout the whole as a "comfort" insole.
That point was underscored by a video that was posted in this thread:
a) Leather insoles are not black. b) Gemming doesn't hold the welt stitches very well...the strain imposed by the welt will open up the fabric around the stitches...making it almost mandatory that the shoes be recrafted and the gemming, as well as the welt, replaced. So your shoes must necessarily go back to the manufacturer if they are to retain any integrity. Shoe repair shops cannot handle this job very well. They don't have access to the materials or the machines.
Personally I think cement sole construction is far worse than GY construction but as I previously implied, at least we all know what we are getting when we buy cement construction. It's not masquerading as something else.