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If the quality of case savers is becoming variable then the risk in using them seems just too great.
With a Time sert at least you have the back up option of fitting either a case saver or Big Sert if the original does pull but if a case saver fails then there is nothing else left.
I think Time serts are quite good of they are fitted correctly and we always have the cases prepared in a machine shop to ensure that they are 'square' as this factor has a significant impact on strength.
We have probably only fitted around 6 sets but haven't had any issues so far.
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