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I had exactly the same problem. Returned it to retailer a few weeks ago, and have just been alterted that a refund is on its way. I've seen previous reviews suggest that they're unreliable. I'm now worried about buying another one. Can anyone reassure me?

Ok, thanks for clarifying.

I bought a second-hand Arc One which very quickly developed a fault - severely reduced power to one lane. I opened it up and hoped to find a loose wire/simple fix. Annoyingly, there's nothing obvious. BUT... I noticed the cabling was held down with sellotape - see below. Does anyone know if this is normal/part of manufacturing or has a previous owner been inside and 'fixed' it? And any advice on what the problem might be? /media/tinymce_upload/c676f7dba81a07685764bd9fac575a70.jpg

Huh? I haven't seen narrow straights, only side swipes (normal to narrow and vice versa).I wanted to try a straight (probably a half, actually) between hairpin curves, that's all.

I'd love to add chicane straights to the side swipes and hairpin curves. Any reason they're not made - or am I missing something obvious?!

You have 6 x Radius 2 90° curves and 4 x Radius 2 45° curves. This is helpful: https://www.thinglink.com/scene/876029698369388545?buttonSource=viewLimits