Changes

Construction, operation and maintenance
'''Construct a spring''':
[[Image:SpringBox2.jpg|thumb|right|200px| Click to zoom. A spring box with 1 side cut away, showing the inner mechanics. <br> Click image for details. Drawing: PACE, [httphttps://www.googledropbox.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCYQFjAA&url=http/gbqab5grp8fsq96/Spring%3A%2%2Fwww20protection.paceproject.net%2FUserFiles%2FFile%2FWaterpdf?dl=0%2FSpring3Fdl%2520protection.pdf&ei=-JVvT46gCbPTiALh_f22BQ&usg=AFQjCNFx5ztSs292dWllJ0EiBwcs2MgOXQ&sig2=0KXnHRagsjMCDzGxlJCxPw 3D1 Spring protection].]]
[[Image:SpringProtection_finished.jpg|thumb|right|200px|Click to zoom. A finished spring with a fence for protection. <br> Click image for details. Drawing: PACE, [https://www.dropbox.com/s/gbqab5grp8fsq96/Spring%20protection.pdf?dl=0%3Fdl%3D1 Spring protection].]]
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