Manhattan Watch Co. repair

[Hudson777]

I am working on a Manhattan Watch Co. pocket watch with the two knobs that come out of the case for time setting, and stoping the watch.

I have given the watch a cleaning and have assembled/lubricated it. When I wind the watch, the mainspring slips inside the barrel. Is it designed to do that? I don't wind it very much before it slips. The end of the mainspring is folded back over itself and catches the side of the barrel. I am wondering if I should file the tip slightly so it has an edge to catch onto the knub inside of the rim barrel. Any thoughts would be appreciated.

Hudson

[Samantha]

Hudson,
The mainspring shouldn't slip. The end should catch on the barrel. Is it a new mainspring?
Samantha

[Hudson777]

Mainspring is original.. It is very large, strong spring...(compared to an 18s Waltham for example).