A retractor holding frame, comprising: a support body comprising: a first bore extending transversely through the support body from a first side of the support body to a second side of the support body opposite the first side, a second bore extending transversely through the support body from the second side to the first side, a left support frame arm comprising: a first annular hub configured to be disposed within the first bore of the support body, a first plurality of posts disposed along an outer edge of the left support frame arm and configured to receive and retain at least a first retractor in a first orientation, and a right support frame arm comprising: a second annular hub configured to be disposed within the second bore of the support body, a second plurality of posts disposed along an outer edge of the right support frame arm and configured to receive and retain at least a second retractor in a second orientation, characterised in that the support body further comprises: a first spring-biased locking mechanism including a first retaining pin configured to extend down into the first bore, and a second spring-biased locking mechanism including a second retaining pin configured to extend down into the second bore; the left support frame arm comprises a first annular series of detents configured to selectively receive the first retaining pin and thereby fix the left support frame in a desired orientation with respect to the support body; and the right support frame arm comprises a second annular series of detents configured to selectively receive the second retaining pin and thereby fix the right support frame in a desired orientation with respect to the support body. a support body comprising: a first bore extending transversely through the support body from a first side of the support body to a second side of the support body opposite the first side, a second bore extending transversely through the support body from the second side to the first side, a first bore extending transversely through the support body from a first side of the support body to a second side of the support body opposite the first side, a second bore extending transversely through the support body from the second side to the first side, a left support frame arm comprising: a first annular hub configured to be disposed within the first bore of the support body, a first plurality of posts disposed along an outer edge of the left support frame arm and configured to receive and retain at least a first retractor in a first orientation, and a first annular hub configured to be disposed within the first bore of the support body, a first plurality of posts disposed along an outer edge of the left support frame arm and configured to receive and retain at least a first retractor in a first orientation, and a right support frame arm comprising: a second annular hub configured to be disposed within the second bore of the support body, a second plurality of posts disposed along an outer edge of the right support frame arm and configured to receive and retain at least a second retractor in a second orientation, characterised in that a second annular hub configured to be disposed within the second bore of the support body, a second plurality of posts disposed along an outer edge of the right support frame arm and configured to receive and retain at least a second retractor in a second orientation, characterised in that a first spring-biased locking mechanism including a first retaining pin configured to extend down into the first bore, and a second spring-biased locking mechanism including a second retaining pin configured to extend down into the second bore; the left support frame arm comprises a first annular series of detents configured to selectively receive the first retaining pin and thereby fix the left support frame in a desired orientation with respect to the support body; and the right support frame arm comprises a second annular series of detents configured to selectively receive the second retaining pin and thereby fix the right support frame in a desired orientation with respect to the support body.