I had the exact same problem when building my SV2. One front wishbone was slightly binding and didn't drop under its own weight. I tried the reamer and GT85 but that didn't work for me so I then sanded a mm off the outer edge of the wishbone itself and now it's perfect. Just something else to bear in mind if the reamer doesn't work. In my case it wasn't the hole itself that was the issue, the wishbone was a little right up against the hinge pin holder.
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