I am glad your second version of the clasp worked out well. As with
everything, we learn as we go forward, adjusting, refining, and
improving upon our first attempts.
I have used this style of cylinder clasp on many bracelets and have
not experienced the problem of the chain flattening out as you
described. That in turn could be due to any number of factors
including the diameter of the chain, the metal and gauge of wire
being used, and the tightness of the crochet structure itself. For a
fine silver bracelet a good alternative to a cylinder clasp would be
end caps and a toggle style clasp.
As you progress with the crochet, and the resulting chains become
tighter and more consistent, you will probably notice they are much
less susceptible to wear. An open chain, or one in which the size of
the crochet loops is large, tends to be less dense and compact and
this allows the structure to be more easily compressed or deformed. A
very well made hand crochet chain of this technique is not overly
delicate, and it will hold up very well to daily use. The necklace I
wear is crocheted in 22kt and shows no visible signs of wear, even
after many years.
Michael David Sturlin