In his masterpiece "Introduction to the `Laryngeal Theory'"
(Innsbruck, 1997, pp. 143) by Fredrik Otto Lindeman, I found paragraph:
Semantically doubtful is Hamp's etymological equation (Linguistica 33,
1993. 62 f.) of Skt. s'ikha: `taft of hair, crest, point, tip, border,
knife-edge, arrow' with Alb. <thikë> `knife, blade; straight up' on
the strength of which he reconstructs an old ablauting noun *k'ik-(e)
H2 or *k'ikW-e(e)H2; the aspirate of <s'ikha:> supposedly reflects a
stem *k'ikH2- or *k'ikWH2-.
Other derivative, to my view, is Alb. <cik> `upper part of the side of
a container: brim, rim, lip; height, acme, peak' from PAlb. <tsiko>
derived from stem *k'ik-o or *k'ikW-o that made the Alb. cognate not
only phonetically, but as well semantically completely plausible.
Outcome of *k' > *ts > c seems to belong to new layer, as well as *g'
> *dz > x.
Konushevci