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If you have KMC knowledge that would be extra useful
KMC B1 is the most old fashioned looking, no peening or mushrooming of the pins to make rejoining questionable. In the olden days, all chains were like that.
These days, if I need a track chain to have an adjustable length, I use two spring clip master links and a selection of short insert lengths, e.g. 96 links with one master link gives 98 links with two master links and a single inner link or 100 links with two master links and a stub consisting of inner-outer-inner -
Old Style Chains
As Tester says all chains used to have pins which projected a little way beyond the side plates, and this is true for 3/32" as well as 1/8". I prefer to stick to this type for my own use.
My method for splitting/ joining is to use a Reynolds 'Elite' chain tool (pic below) which pushes the pin just clear of the side plate so that the whole male link can be removed (just as if it were a spring link).
To rejoin I use a 'dimple' punch (see pic) to refit the side plate and then, supporting the chain on something solid, I give a few sharp taps to the pins of that link to spread them a little.
I don't usually bother with spring links and (touch wood) I haven't had any failures so far.
Which 1/8 track chains have replaceable / reusable pins? If you have KMC knowledge that would be extra useful. Cheers!