Hi Rookie,
To be honest I only use stretched sprue ...keep buying kits you wont run out ;D Anyway ,how I do it is ....leave the length longer than needed . Attach one end using CA ( superglue) this wont melt the plastic . When its dry use snips to cut to the required length ,dont worry about it being slightly too long ,then fix that end in place (again using Superglue ) Once its all dry ,heat up an old blade /pin or similar ,now hold the heated blade close to the wire ,but not touching and run it up and down the length of the wire ,this will shrink it and tension it .Might take a little practice ,but it does work .........
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Chris.