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From your picture, I can't tell exactly what you've got going on there, but it does appear that your hub has come loose from the axle a fraction of an inch. If that's the case, and you have previously released the parking brake, loosened the shoe adjustment all the way, and released the brake fluid (I see that you have juice brakes), then perhaps your drum has an internal worn ridge upon which the shoe is hung up, or when the shoes were installed, the retainer clips were left off, allowing the shoe to bind. Upon removal of the tool you have installed, and then knocking the hub with a mallet while wiggling it around, you may get lucky if the hub is actually released from the axle. If it isn't, then the
KRW type tool is the only way to go. All failing and your shoes are hung up, the red wrench will be the tool of last resort.