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Make and model of application?
Coupler is bolted to flywheel with 4, 1/4 inch bolts. 7/16 heads.
Application? If on the front of unit, the crankshaft will be keyed and the adapter would be held with a 7/16 bolt in the center. With bolt removed, the adapter may need to be removed with a puller.
What is application? It has to be held with something!
Attach picture using the paper clip icon above typing bar?
With your lack of information, you did the right thing!