The ornamental design for a manualloosener, as shown and described.
FIG. 1 is a perspective view of a manual loosener showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a a rear elevation view with the head of the tool rotated; and,
FIG. 7 is a front elevation view with the head of the tool rotated.
The broken lines showing of the manual loosener is included for the purpose of illustrating portions of the article and forms no part of the claimed design.