Cika wannan jumla: Yayin da kakar ta ci gaba, ƙungiyar ta yi gwaji tare da dacewa da 'fuka-fuki' na aerofoil zuwa motar. A Grand Prix na Italiya da Grand Prix na Amurka misali, Stewart ya yi tsere da MS10 tare da reshe mai ɗorewa mai ɗorewa, irin wannan nau'in da aka haramta a kakar wasa ta gaba bayan duk direbobin Lotus sun sha wahala kusan haɗarin mutuwa a
Gasar Cin Kofin Spain. A gasar Grand Prix ta Afirka ta Kudu ta 1969 an yi tseren motar da fuka-fuki biyu masu tsayi, daya a gaban kuma daya a bayan dakatarwa. A wasu tsere MS10 ya yi tsere tare da reshe na kasa, kamar lokacin da Stewart ya yi nasara a gasar Grand Prix na Jamus.