All Question On One Page false false When he was younger, David often played with Lego. 1 David lost his right arm in an accident. 2 'Hand Solo' is the name David gives to his arm. 2 David built MK1 soon after creating his first Lego arm. 2 David could use MK1 when exercising. 1 David built MK1 in under a week. 1 MK2 requires an external power source. 1 David's friends respect his achievement. 1