Furthermore, detents, color-coding or other mechanisms may be provided to facilitate proper radial and longitudinal alignment of delivery tube 610, needle tube 620 (as well as anchor loading slot 624 and skives 628 of the needle tube), anchor pushrod 630 and revolver 640 (as well as successive chambers 642 of the revolver) relative to one another. [0204] With reference now to FIGS. 28-34, addition