Changing bolt and nut to CS 2 had been carried out twice. Total replaced bolt and nut are 180 pcs todate. (equivalent to 45 bars). It is estimated that after 2 more times checking and bolt & nut replacement, all 100 bars will get new bolt and nuts. Replacement is deemed necessary as bolt and nuts had started to give way under current working condition. Previous bolt and nuts were in use started from 1st September 2009. Upon observation, it is best to replace bolt and nut MS 1/2" x 1 1/2" after 6 months or up to 9 months to ensure no CS breakdown due to broken bolt and nut.
Earlier there had been an idea to use HT bolt and nut in place of existing MS bolt and nut, but after considering nature of previous breakdowns inside CS here, it is best to still use same bolt and nut's material. Usage of HT bolt and nut may cause more breakdown as bolt and nut is no longer the weakest point... it may cause either bracket if not chain to break.
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CS 1 will be emptied after processing tonight (Saturday). Checking and changes of bolt and nut will be carried out tomorrow. After completed, processing will commence during night time tomorrow (Sunday).
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