Roger, Bob and Brooke, Thanks for your kind advice. I have just checked the LHA adjuster knob and, unfortunately, there is no sign of any potential in-out movement. I did as suggested by Bob and Brooke and bought some penetrating oil which has loosened up the mechanism but I think I shall need to strip and regrease it to make it silky smooth.
I am still hoping that somebody might have an exploded diagram before I venture into the unknown. Geoff -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roger W. Sinnott Sent: 04 July 2009 17:44 To: 'Sundials' Subject: Re: Sundial compass on eBay Geoff (and others), Sorry about the accidental blank message just sent. I have an AstroCompass (but not readily accessible at the moment). If I remember correctly, one main knob (possibly the LHA mechanism you mention) operated very stiffly until I PUSHED IN ON THIS KNOB. It is spring loaded to prevent turning by mistake. -- Roger ----- Original Message ----- From: "Roger W. Sinnott" <[email protected]> To: <[email protected]>; "'Peter Mayer'" <[email protected]>; "'Sundials'" <[email protected]> Sent: Saturday, July 04, 2009 12:34 PM Subject: Re: Sundial compass on eBay > > ----- Original Message ----- > From: "The Thurstons" <[email protected]> > To: "'Peter Mayer'" <[email protected]>; "'Sundials'" > <[email protected]> > Sent: Friday, July 03, 2009 12:45 PM > Subject: RE: Sundial compass on eBay > > >> Folks, >> >> Alerted by Peter's message below, I have just bought an ex-Air >> Ministry Astro Compass MkII from eBay. I have wanted one of these for >> a while so thanks to Peter for posting about it. The instrument seems >> to be in pretty good condition but the LHA mechanism is stiff to turn >> and I am wondering about attempting to free it. Before I blunder in, >> I should be grateful for any advice on: >> - what lies inside the LHA mechanism >> - whether I can just apply some WD-40 and hope it finds its way to >> the critical parts >> - whether I could disassemble it with any hope of putting it back >> together >> >> Best Wishes, >> >> Geoff --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
