Cheers, they ain't that tight as I was concerned with digging into the leather, but if they do prove awkward I can loosen them off some by remounting the top bolt a few inches closer to the bottom two. I had to fight the urge to slap glue between the bolts which would have been overkill strength wise and made them a pig to alter. Old habits die hard!
I've put a coat of satin yacht varnish on them, I don't think it will need a second. The glues waterproof.
ATB
Tom