Nope, only hip swivel articulation & thigh articulation to achieve gerwalk mode.
Its a plamo, we need to be careful with all joints, but stress marks are irremediable...
I dont see any weak point on plain valks, considering that is a plamo.
Problems cames posing valk on battroid mode with SuperPacks & ArmourPacks wing-boosters.
The croth peg is the most delicated part of all. This peg supports the weight of upper half body (with wingboosters) when in the ground, and suports the weight of the legs when in an ActionBase:
Peg fitted on SP battroid mode:
VF-25s Broken peg due to SP weight (now its glued on fighter mode):
Other weak point on SP are the wings hinges due to de wing boosters weight. Remove the wingboosters before handling.
Now with ArmourPacks, Bandai includes a lot of attachments pieces that solve this problems, but those are used with their respective Armored ...