青云翻译

Trapezoidal thread stripped parts of the stem after the protective oil paper, coated in grease to re-site trapezoidal thread

Stripped stem trapezoidal thread parts after the protective paper, trapezoidal thread re-coated parts grease

After rips the valve lever acme thread spot the protection oiled paper, spreads the lubricant in the acme thread spot

Valve stem peeling the protective whispering trapezoidal thread parts after re-coating grease trapezoidal thread parts

Stripped stem trapezoidal thread parts after the protective paper, trapezoidal thread re-coated parts grease