Dahlia Tuber Not Sprouting

Could someone please help me with a Dahlia related question? I have an heirloom Dahlia tuber that grew ok last year and it survived Winter storage here in Illinois. The tuber feels firm when I planted it however I saw no "eye" (or sprout). I still saw nothing and last week I carefully dug it up for inspection and the tuber is very firm but no sprout yet. What can I do to get the tuber to sprout and at least grow leaves for next year? I hate to lose this tuber since I have had it growing all these years since my Grandmother died over 20 years ago.
Thanks in advance for any advice.
Lou Leciejewski
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