This might be the way to go on the thin wires, heat shrink it onto the bootlace ferrule end and that will stop it slipping. Below is on 0.9mm OD wire.
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Mine are fine from the looks of them, can't recall if I bought them new or not as I have had them for a good while.Very neat, a lovely job.
Beware of those 37 pin D Sub to terminal blocks if they are second hand. On my Beaver I've been having intermittent problems eventually traced to one of those with loads of dry joints. I spent an entire day, unwiring, labelling and re-soldering all five of them, one block had all 37 pins in a bad state , with others with just a few pins. On the bad one, each pin had a solder 'skirt' about 0.5 mm off the board! Check them !
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It does a good job and will help in the future if I have to go in there to alter anything but it is quite expensive as you only get 1.5m of shrink on a cassette and it doesn't go far especially with the waste on each print. I have learned now to do them all in batches with 3 spaces between each one and that means I only lose 1 length of 25mm tube at the start instead of 1 for each.excellent, simple solution