Here's one of the HS-913 spar caps clecoed ready to match drill. Because of the natural bend in the spar caps created during manufacture, they need to be clamped nice and tight prior to drilling which is shown down the page a little...
A different angle...
I used the drill guide to make sure the drill was perpendicular to the flange and you can see the clamps being used to good effect. I tried to get them as close as possible to the hole I was drilling and moved them every couple of holes to ensure the spar caps are as tight as possible.
Here's another angle of how I was able to reset the clamps after almost every hole. It actually sat nicely to be able to use the drill at right angles.
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