拉绳（弹簧）扣，绳索扣，绳扣，拉绳调节扣的英文

stopper

• 拉:    cut; slash; slit
• 绳:    rope; cord; string
• 弹簧:    spring; mechanical ...
• 扣:    button up; buckle
• 绳索:    rope; cord; cordag ...
• 调节:    regulate; adjust; ...