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Message: <blockquote data-quote="etheesdad" data-source="post: 347308" data-attributes="member: 84335"><p>thanks very much for the reply. It makes it a lot easier to understand the mechanics when they're quantified. Your post was really helpful. Cheers. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>