On Wednesday, May 9, 2018 at 7:38:35 AM UTC-4, son_of_flubber wrote:
If we wait long enough, somebody of dubious credential will come along and say that pushing on the wingtips is just fine. Have at it.

There is no credentialing on either side so far. I don't know what the answer is. The first question is what does the glider manual say? Any manufacturer statements against it? Most of the time old practices are sound but sometimes it's just some cranks dumb idea that got perpetuated into being SOP.