Chains
The endless chain story is nonsense to get you into the workshop. If a link is fitted correctly it is exactly as strong as the rest of the chain and won't fail.
Some high quality chains only come endless or with riveting links (for example DID X-Ring) or alternatively you have to fit the very good and safe screw links.
Never fit an old link into a new chain and never mix chains and links of different manufacturers (except aftermarket screw links specially designed to fit a specific manufacturers chains). Although having the same external dimensions the chains of different manufacturers often differ in internal measurements.
The best way is to get a quality chain tool like the one DID sells for their chains. This is overkill if you only do your own bike as you get a good nomber of screw links for the same money.
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