Landeron 248 Chronograph service - part 1

This Landeron 248 Chronograph movement has an issue in the mainspring, which avoids it to fully charge. Basically after 7/8 turns of the crown it slips off the barrel and unloads all the power. This obviously needs to be sorted out, either by replacing the mainspring or the barrel arbor, one of which could be damaged or worn too much - Check out our website and online shop: http://www.onlyvintagewatches.com - Support me also on Patreon: https://www.patreon.com/onlyvintagewatches