You said it.  If you consider yourself sufficiently skilled to repair
a spring motor, you're sufficiently skilled to build yourself a spring
winder: they're not difficult to construct and they make the job far
safer and easier.

It's usually not hard to repair a spring -- they typically break at one
end or the other and thus no sort of splicing is necessary -- but the
repair doesn't always hold, and you may be finding yourself re-doing
the job.  Hence the spring winder.

Mark Kinsler
Lancaster, Ohio, USA
http://www.frognet.net/~kinsler