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And yes tbuelna, it does require a constant, slow and controlled force of retraction or even a force that decreases as it winds in.

All the advice given is very much appreciated. I shall look into the ideas and considerations mentioned.

Many thanks for both your replies. I just looked at clockwork motors Greg Locock and that seems like it could be a viable option. There are 2 options for specs; the diameter of the spool can be no more than 50mm and width of the spool no more than 100mm. Or diameter < 85mm and width < 70mm...

Hi there, I'm looking for types of retractable springs. From what I've found, I'm a bit unsure of what springs are used in tape measures (not the tape itself). What I've gathered is that it could either be a; power spring, extension/constant force spring, or spiral torsion spring. What I'm...