 Aspinall's engineering achievements are sometimes dismissed as he borrowed so heavily from American designs, but his business acumen and talent for re-working existing ideas (such as creating a revolving ink-disk for his flat-bed presses) are widely acknowledged.Engineer Frederick Ayers became involved with the company in 1923 when his company started supplying parts to the fledgling Adana Agency.He became friends with Aspinall, and began to offer design advice.