Headgardener
Armchair Cyclist
Speicher. I think your spring should have a ring formed at one end of it (the curly bit) and at the other end should be a hook and it sounds as if this hook has straightened out or snapped off possibly under the strain of being dropped. Your best chance IMO would be to find an engineers suppliers, try looking in the Yellow Pages, there must be one some where nearby as Brum was full of them at one time. Hope this helps.