Mermod.......when we think of the scale of 1:20....depending on the glasses of red wine
I see two calculations
A. 4Kg (20*20) =
1600 Kg
B. 20Kg (20*20) =
8000 Kg....which has suffered material yield in shear
.....
These later two
kg values would relate to bollard pull..........
From this I think the latter is pretty realistic...........
1. My only thought would be to replace the [Grade?] brass pins with AISI Grade 316 stainless material which has some 1.3 times the yield over the brass
2. Increase the pin sizing
Keep us posted with your progress......Derek