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Monday 27 November 2017 at 07:08
In my tenure in the pinball hobby springs are at the bottom of the list of parts that need changing in an EM pinball machine no matter where applied in the game unless clearly damaged or missing.
Good tutorial.
Source: http://pinside.com/pinball/forum/topic/tech-gtb-sky-jump-drop-target-teardown-rebuild/page/2#post-4093733