在采用小口径钻进时，我队一直沿用“内槽式岩心卡簧”。这种卡簧效果虽好，但加工比较困难。后来我队遵照毛主席“独立自主，自力更生”的教导，试用汽车废弹簧钢板改制岩心卡簧成功（图1）解决了我队在推广小口径钻进中卡簧供不应求的问题。 In the small diameter drilling, our team has been using “inner groove card spring.” This retainer effect is good, but the processing is more difficult. Later, in accordance with the teaching of Chairman Mao’s “Independent and Self-reliance” trial, the team successfully tested the reed-in core retainer of automobile scrap spring steel plate (Figure 1) to solve the problem of the shortage of retainer in the promotion of small-diameter drilling by our team.