I love the these 'ole large format camera's and there versatility!

~Got a magnifying glass, make it into a soft lens.
~Need a quick film back for a 4x5 but don't have one... make a light tight addition to a 3x4 .. MF 2x2 Sunydam Roll Film Adapter, that you do have!
~Want to shoot MF 6x9, why just cut a piece of 4x5 in half, giving you 6x10!
(Insert it into regular film holder, with spacer already in place, having also been cut in half, from a dud developed 4x5.
Ha, ... this may be special, as there are no 6x10 roll film adapters that I could find for 4x5.
Note: Be sure to compose the picture for the correct half on the ground glass.

So... what have you done creatively, with your Speed, it would be interesting to know?

There are a number of 6x12 roll holders for 4x5 cameras. Two, the Sinar (a number of versions) and the Cambo/Calumet, are insertion type and can be used with spring backs. The others can be used only with Graflok backs.