Author: Gordon (NZ)
Date: 2010-06-02 11:49
"I beg for pardon!"
Pardon given. 
I agree, a lead backing block, rather than timber, is far better if impact is going to be involved.
Also, a significant length of needle spring of typical needle spring diameter actually makes a very poor punch, because it actually has quite a lot of compressibility and opportunity to buckle, which greatly reduce impact.
Any removal of a spring stump using impact runs a fairly high risk of the punch sliding off the spring, and impacting on the post itself, leaving dents around the spring. And this makes it increasingly difficult to keep the punch on the spring. It can also make the end of the spring increasingly impossible to even locate.
All of which are excellent reasons why the plier method is a lot better. Applying steady force, with perfect alignment, rather than applying an impact, has zillions much more control.
With impact, you may strike it lucky with some relatively loose spring stumps, but sooner or later you will strike a tight one, and mess things up a fair bit without much success.
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