压缩到位是让圆弹簧对上压盘的压力消失，才能安全顺利的取下上压盘锁紧螺母。
1/47
2/47
3/47
4/47
5/47
6/47
7/47
8/47
9/47
10/47
11/47
12/47
13/47
14/47
15/47
16/47
17/47
18/47
19/47
20/47
21/47
22/47
23/47
24/47
25/47
26/47
27/47
28/47
29/47
30/47
31/47
32/47
33/47
34/47
35/47
36/47
37/47
38/47
39/47
40/47
41/47
42/47
43/47
44/47
45/47
46/47
47/47