Fleecewife, would you PM me where you got your Shetland carded? The last thing I want to do is send all my precious first Shetland fleeces off to have them come back a mess
A treadled drum carder - What a good idea
I will pm you the name jaykay. The lesson I learned though is not to send off the fleeces for carding straight from the sheep. I should have done a frair amount of prep of them before they went, but I didn't know what to expect (it was a while back).
What I should have done was to make sure the fleeces had been shorn through the rise, but as they had been machine shorn they weren't. This meant that there were lots of short lengths of new wool in with the fleece - these turned into the noils on processing. The way to deal with that is to turn the fleece cut side up and re-shear it through the rise, removing the new growth (using hand shears). That's a total drag which is why I persuaded my OH to learn to hand shear, then to teach me, so all our fleeces would be as suitable as possible for hand or small system processing without any extra work.
I should also have removed any britch wool or short skirtings which would spoil the overall quality of the final batts. Ah well - you live and learn

I think I assumed the processor would sort the fleeces before putting them through the carder. So now I have a giant sack of carded batt which I use for making 'work' clothing as well as for teaching others to spin, but it's not much good for pleasurable spinning. I am about halfway down the sack
Another thing worth doing would be to phone the processor and find out just what their machinery can cope with. When I complained about the quality of my fibre, I was told that it was too fine for their machinery. Presumably they have a carder which is suitable for a middle of the road quality of fleece, but the Shetland fleeces I sent off were particularly fine.
I'm sure there are processors out there who will do a fine job - I just didn't plump for the right one first time around.