This was one of them, my Gardner barbel spoon landing net, great bit of kit and I was very lucky to net a few lumps in it last year, but even that action of the frame just flexing is enough to loosen the screws, as pictured, which I've re-tightened enough times now for it to be getting annoying!
So I decided to do away with them altogether for something a bit more substantial.....
Drill the spreader block out to about 5mm. . . . . .
I drilled the block out first, then inserted the 'arm' and then drilled it out, I
did it this way because the arm then goes in a touch further, which in my mind
is a little bit more secure, it certainly feels solid once in.
Do it properly, and you only do it once . . . . . . . . ;)