This is what you usually cannot see with naked eyes.
In the picture below, you see on the original (OEM) spring guide hof HW30 showing some bucking.
The reason is very simple. The OEM spring guide is way below the required OD size for the spring.
Secondly, the Material that used for the guide is not strong enough to hold the power of the spring.
This picture shows the custom made spring guide.
No bucking observed. Alignment of the tophat is not inline with the guide thus the little difference you see down there.