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Thread: Removed captive setscrews from TeleVue Barlow/Powermate

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    Default Removed captive setscrews from TeleVue Barlow/Powermate



    Thought I would share this experience and ask for help as well.

    I've been away from Astronomy for 10 years and starting up again. When doing inventory I realized that my TeleVue 2X Barlow and 2.5X Powermate both have just captive setscrews/thumb screws instead of compression rings. While some people don't mind setscrew marks on their eyepiece barrels, I believe it affects the re-sale value and I tend to buy and sell my eyepieces fairly regularly when active and would like to retain as much value as possible.

    Since the optics are still great, rather then selling/re-buying and taking the hit, I decided to remove the thumb screws and replace with nylon or plastic. I got some great advice from a TeleVue support person who said to use acetone to dissolve the adhesive that holds on the head, remove the head, then thread the screw out the barrel.

    For the barlow, I unscrewed the lens cell and was able to set the housing in a small milk-glass bowl partially filled with acetone enough to cover the thumb screw head but not touch the barrel. After 1/2 hour of soaking, I used two taped needlenose pliers to easily remove the head and the screw came right out. I could re-use the screw if I needed to.

    The Powermate was a lot tougher. I had to soak it overnight and even then it took a lot of force to remove the head resulting in damage to the aluminum screw. I got it out, but I can't re-use the screw.

    So I thought success! However I hadn't sourced the nylon screws yet.

    For my items, they use an M4-.7 thread. In America, there are very limited options for M4 nylon, plastic, delrin, carbon fiber, nylon tipped, etc. screws with a knurled head. Tried McMaster and a number of other sites including Amazon and Ebay, and all of my local hardware stores. Most non-metallic screws are SAE sizes. ScopeStuff and a couple other sites have one that will work, but I really don't like the design, very tiny head for adjusting in the cold and dark. Alibaba from China lists a number of good ones, but you need to buy in bulk. I don't mind buying a package of 10-50, but not 1,000 or more! McMaster has a good head to make my own, but not an M4 nylon screw to put in the head, argh.

    Does anyone have a good USA source for M4 plastic, nylon or other non-metallic thumb screws? It needs to have a good head for easy adjusting at the scope that will hopefully work with gloves. Any guidance would be appreciated.

    Thanks! Tom Kelley
    Current scope: Nexstar 11 GPS, carbon fiber tube, CGE tripod, Feathertouch micro-focuser, Starizona landing pad, AP 2" visual back w/Baader 2" click-lock connector.
    Televue Radians 8mm, 10mm, 12mm, 14mm, 18mm, Panoptic 22mm, Celestron 30mm Ultima.
    Barlows/Focal Reducer: TeleVue 2x, TeleVue 2.5X Powermate, Celestron 6.3 FR.

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    Default Re: Removed captive setscrews from TeleVue Barlow/Powermate

    Welcome!
    And Welcome back to astronomy!

    I donno, Tom...
    Will any of these sources work?

    https://www.google.com/search?q=M4+N...utf-8&oe=utf-8

    I would advise a bit of caution with nylon hardware, they tend to break, or twist off easily. In my experience.
    I have some in my Orion gear that have a nylon, or delron, plastic nose piece inserted in a small hollow of the nose of the screw.
    Last edited by SonnyE; 01-18-2016 at 05:08 PM.

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    Default Re: Removed captive setscrews from TeleVue Barlow/Powermate

    Also check ScopeStuff - Telescope Accessories and Hardware. They may have these, but I'm not sure. On my iPad presently or I'd look too.
    Bryan

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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    Default Re: Removed captive setscrews from TeleVue Barlow/Powermate

    Quote Originally Posted by bladekeeper View Post
    Also check ScopeStuff - Telescope Accessories and Hardware. They may have these, but I'm not sure. On my iPad presently or I'd look too.
    Good lead, Bryan.
    ScopeStuff
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    Default Re: Removed captive setscrews from TeleVue Barlow/Powermate

    Quote Originally Posted by SonnyE View Post
    Welcome!
    And Welcome back to astronomy!

    I donno, Tom...
    Will any of these sources work?

    https://www.google.com/search?q=M4+N...utf-8&oe=utf-8

    I would advise a bit of caution with nylon hardware, they tend to break, or twist off easily. In my experience.
    I have some in my Orion gear that have a nylon, or delron, plastic nose piece inserted in a small hollow of the nose of the screw.
    SonnyE - This is strange. I've used this same query in Google search a number of times, but for some reason when I use your link I get different results. Some of these look promising. Thanks! TK
    Current scope: Nexstar 11 GPS, carbon fiber tube, CGE tripod, Feathertouch micro-focuser, Starizona landing pad, AP 2" visual back w/Baader 2" click-lock connector.
    Televue Radians 8mm, 10mm, 12mm, 14mm, 18mm, Panoptic 22mm, Celestron 30mm Ultima.
    Barlows/Focal Reducer: TeleVue 2x, TeleVue 2.5X Powermate, Celestron 6.3 FR.

 

 

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