Ian/Richy, many thanks for your help.
Just had a look at my sprocket carriers I've got 3 in total 2 BRM and 1 unbranded and they are pretty much identical. First it would be imposable put the carrier on the wrong way around as the carrier hub is approximately 40mm long and it's off set (sprocket almost flush at one side) so if I did turn it around the hub of the carrier would be tight up to the bearing cassette and be out of alignment with the engine sprocket by about 30mm at least.
Yes I did loosen the sprocket bolts, but when my boy was running his BRM I never had to do this.
When I change the gearing I have sprocket mounted on another carrier ready to go wheel off hub off carrier off 5 mins done, I just find it quicker than trying to fiddle around from the other side through the chain guard to stop the bolts on the nilocks spinning can be a real pain! It's what works for me.
I'm using the new kevlar sprocket's (don't know if they are MSA legal?) I think they are great.
I've been down to the local engineers to see if I could warm up the axel but they said this was a no no as alloy and steel will contract at different temperatures (alloy faster than steel) which would only compound the problem, Shaun was very busy told me to call back on Thursday.
If you need anymore info let me know.
Thanks, Bucky.
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