[ Ken Lowenberg wrote in 200923 MMDigest

> ... crank handle inserted _inside_ the open box

Hi Ken,  In response to your MMD inquiry, might I suggest you contact:

  Al Meekins - The Meekins Music Box Co.
  Zephyrhills, Florida
  https://www.antiquemusicboxes.com/crank.html 
  ameek37754@aol.com.geentroep [delete ".geentroep" to reply]

If he doesn't have a crank on hand, I'm sure he can manufacture one
for you.  See his eBay listing at:

https://www.ebay.com/itm/REGINA-MUSIC-BOX-CRANK-ANY-ANTIQUE-REGINA-MUSIC-BOX-PARTS-GEARS-AL-MEEKINS/203025434156 

Don Caine - Proprietor, The Music Box Repair Center Unlimited
Lomita, California
http://www.musicboxrepaircenter.com/