Black oxide finish
The axial bolts must be frequently lubricated. Avoid splashing welding material in the joints while assembling components (lever, arm).
The quick-acting clamp can be assembled without the central base, directly on another support. To do so, unscrew bolt D2, remove the base and re-assemble the quick-acting clamp on the support located at D2.
Do not forget to weld plates A onto the new support.