Jamgood Posted July 3, 2020 Share Posted July 3, 2020 (edited) Hi Can someone tell me which bolts are needed to fit a second dovetail to the top of a Skywatcher 130PDS. I have a second dovetail which has 4 smaller Allen bolts in the ends but what size are the ones in the middle that attach the to the tube ring. From what I can fathom they are M6 bolts but I want to make sure I get the correct ones/size etc. Hope the image helps explain it. TIA Edited July 3, 2020 by Jamgood Link to comment Share on other sites More sharing options...
knobby Posted July 3, 2020 Share Posted July 3, 2020 (edited) I think they're old fashioned camera tripod top screws, but someone will know for sure. 1/4-20 UNC Edited July 3, 2020 by knobby Link to comment Share on other sites More sharing options...
Helen Posted July 3, 2020 Share Posted July 3, 2020 The answer will be whatever screw size you haven't got 🥺 Or you'll have the right thread but they will be too long, or too short, or the head is the wrong size for the countersink... or.... bitter, me??? Generally they are 1/4-20 UNC Helen Link to comment Share on other sites More sharing options...
Stuart1971 Posted July 3, 2020 Share Posted July 3, 2020 If they are not 1/4” then they will me M6. 👍 Link to comment Share on other sites More sharing options...
John Posted July 3, 2020 Share Posted July 3, 2020 I'm pretty sure that the ones on top are 1/4". The camera mount attached to the rear ring in the picture uses a 1/4" screw up through the tube ring and though the knurled wheel. The front tube ring will be the same. Link to comment Share on other sites More sharing options...
Jamgood Posted July 3, 2020 Author Share Posted July 3, 2020 The threads in the centre of the dovetail bar (first picture) are definitely 1/4-20 UNC. I've used them to attach my camera to it. It's the bolts in the second image I'm concerned for. I'm not sure if they also are 1/4-20 UNC or M6. The holes at the end of the dovetail aren't threaded. I've emailed FLO, I'm sure they'll know the answer. Probably been asked a thousand times. I don't have the scope at hand to try any bolts as the Scope I received today is boxed up ready to go back. (Damaged item) I just want to get the bolts ready for when the replacement arrives so I can attach the second dovetail. Thanks for all the replies guys. Appreciated. If anyone knows the answer for sure, shout it out Link to comment Share on other sites More sharing options...
AstroMuni Posted November 15, 2022 Share Posted November 15, 2022 On 03/07/2020 at 18:54, Jamgood said: I don't have the scope at hand to try any bolts as the Scope I received today is boxed up ready to go back. (Damaged item) I just want to get the bolts ready for when the replacement arrives so I can attach the second dovetail. Did you manage to get to the bottom of this? What was the spec? Link to comment Share on other sites More sharing options...
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