Typical internet jeeping, worried that a spring moves?
If we had a reason? more helpful and techincal advice would be easier to give.

Yes, heat on a spring is a no no, but a tack at the very end of a coil, would never hurt, but because a spring is a more lively metal than what you are "tacking" it to, a tack won't hold anyway.
Then weld it so it does not move? Great plan, grinding out a welded spring to replace it? bizarre.
Oh well.

yes a bolted down clip system?

SD