I use this sitting on a standard dining chair, mine has never been near a desk !! I think it depends on the height of your sofa , mine are too low to feel comfortable pedalling . It is a brilliant machine I have such strong legs now compared to before I bought it.
By CAROL PARKIN on 09 October 2016
Sorry for delay in response, have been away on holiday. I would have thought that the manufacturer would have a supply of spare parts for sale. Best to try them. Good luck!!
By MikeGolfPapa on 17 July 2017