Once again, I am grateful for all of the advice. Perhaps my X-T3 is nonstandard in some form or fashion, but the anchor cord absolutely will not fit through the eyelet, despite having attempted the use of dental floss and the method offered by Pete1959 in his video. Further, the inner portion of the gasket is neither black nor removable -- at least without the exercise of force which I would prefer not to attempt. Instead, I am going to employ the method suggested by Terry B., with the round rather than triangular eyelets. Thanks again for all the help.