ðə dɪzˈaɪn ɪŋkˈoːɹpɚɹˌeɪɾᵻd ɐ kˈɔɪl spɹˈɪŋ, wˌɪtʃ wʌz bˈaʊd ˌɪntʊ ɐ kˈɜːv sˈʌtʃ ðætðə kˈɔɪlz ˌɔn wˈʌn sˈaɪd ʌvðə spɹˈɪŋ wɜː skwˈiːzd tˈaɪtli təɡˌɛðɚ wˌaɪl ɔnðɪ ˈʌðɚ sˈaɪd ðə kˈɔɪlz wɜː spɹˈɛd ɐpˈɑːɹt.
The design incorporated a coil spring, which was bowed into a curve such that the coils on one side of the spring were squeezed tightly together while on the other side the coils were spread apart.