On this drawing of the big wheel, the existing holes for mounting the ROC cards are indicated in red, and thin green lines show where the gap between the ROC cards are located. I would like to add 4 small (about 1.5mm) diameter) holes on these lines. We can 'sew buttons' in these places to help hold down the ROC cards onto the cooling plate. The location as measured from the edge of the plate (fat green line, this is the joint between the plate and te cooling tube) are:
191 mm 196 mm 249 mm 254 mmThe distances are not critical to ~1mm, as long as they are in the gap. The easiest wat to locate them is to use the cardboard ROCs: Screw 2 in place, draw or scribe a line in the gap between the two, remove one ROC, and mark the radial locations. Transfer the locations to the carboard ROC edge, and go around the plate. 6x4 holes per plate. Since we may use string through these holes, they should be deburred on both sides.
