The ornamental design for a holder for an opticalconnector end-face polishing machine, as shown and described.
FIG. 1 is a perspective view of a holder for an optical connector end-face polishing machine;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing is included for the purpose of illustrating portions of the holder for an optical connector end-face polishing machine and forms no part of the claimed design.