Here are some links you might like;
My ebay store; https://www.ebay.com/str/jrclockerwatchesandclocks
The link to the Video Ebay did of our Family business: https://www.youtube.com/watch?v=wopk1nUpd_U&t=6s
NAWCC link; NAWCC.org
Link to spring replacement service; https://www.ebay.com/itm/HERMLE-CLOCK-MAINSPRING-REPLACEMENT-SERVICE-INCLUDES-return-SHIPPING-JR06/374378201755?pageci=23849ba7-1f9d-4dcd-b37a-00d3749ee8ab&redirect=mobile