A piece of 150x50 with ply screwed on each side, half-circles of the appropriate diameter for the tube to rest in, sash clamped back to a bench in this case. It can be clamped to whatever is handy at the local sports field or the range for checking things at 100m and beyond. Elastic is used to tension the scope down into the recesses and also prevent it from getting accidentally knocked onto the ground. Can rotate 90 to check windage on the same scale as elevation (see below).
This is the other end of the arrangement. The tripod gives flexibility for setting up at any distance. The bar in this case is marked up at 100mm spacings for confirming mrad at 100m.
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