I bought this kit for a prototype project not knowing what spring tension or length would be required. Tension change is somewhat similar on all, apparently with two tension options for the outer springs. The stretch quality is minimally acceptable, the loss of tension when stretching is more than 30%-50% of its length. I would suggest using this product if the nib is limited in length and just for momentary needs. For the price, especially with shipping included. Is this set suitable for home use?
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