Clamping irregular shaped objects while stitching

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Hello All - Wondering if anyone has come up with a clever way to hold irregular shaped objects while stitching. 

In my case I am stitching up a tube and my neck/back is killing me from holding it in my lap, table, hands, etc. 

What have you come up with?  Thanks! 

[fredk]

Not something I need to do very often but a couple of clean socks filled with sand and sealed up, placed either side and into your stitching clamp should hold the tube in place. Or a couple of lengths of timber with a large V groove cut into the length of each. Use one either side of the tube in your stitching clamp

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Thanks @fredk!  The V-groove cut lumber would do the job nicely.  I'll go with that and let you know how it turns out.