Pinch rods supplement: internal mitres-d4514e06-0bb5-40ae-a7f3-b6facdfd5b2e.jpeg
I concede it is possible to use a tape measure.
Pinch rods supplement: internal mitres-606dbf9f-2dd3-4cc3-a749-07f0c60c23cb.jpeg
Hmmm
Pinch rods supplement: internal mitres-d723f524-bb82-4e99-8f21-e29ca2e09ab7.jpeg