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Thread: HF tailcap fix?

  1. #1

    Default HF tailcap fix?

    Hey guys, first let me start by saying I hope Guy is okay. I emailed him and there was no response.

    I have an HF where the tailcap switch isn't working. Its works with the momentary switch so I assume the contacts might be dirty. What would be the best tool to take the tailcap apart? Snap ring pliers?

    Also as a side note, would anyone know where to get the Nuke batteries, Ive looked all around and couldn't find anything.

    Thanks

  2. #2
    Flashaholic* Got Lumens?'s Avatar
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    Default Re: HF tailcap fix?

    Welcome to CPF

    The HF tailcap can be disassembled using a pin wrench or a small pair of needle nose pliers. Prometheus Lights sells a switch tool that works great. Be very careful as there are small springs and ball bearing in there. I give it a medium difficulty rating reassembling the switch. You can clean both the contacts and ball with no-oxide gold or red.

  3. #3
    Enlightened CRX_'s Avatar
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    Default Re: HF tailcap fix?

    Quote Originally Posted by 2wenty View Post
    Hey guys, first let me start by saying I hope Guy is okay. I emailed him and there was no response.

    I have an HF where the tailcap switch isn't working. Its works with the momentary switch so I assume the contacts might be dirty. What would be the best tool to take the tailcap apart? Snap ring pliers?

    Also as a side note, would anyone know where to get the Nuke batteries, Ive looked all around and couldn't find anything.

    Thanks
    Here's a teadown of the HF-R Ti UTT switch that might help you.

    The resistor values in the switch are:
    92A – 887Ω
    201 – 200Ω
    150 – 15 Ω
    5R1 – 5.1Ω
    0 – 0Ω

    Couple of my HF-R Mods




  4. #4

    Default Re: HF tailcap fix?

    Thanks guys. Much appreciated.

    CRX, funny I was just looking at your lights on reddit. Awesome work. I was wondering how your momentary worked on the one with the MT-G2 emitter.


  5. #5
    Flashaholic* Got Lumens?'s Avatar
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    Default Re: HF tailcap fix?

    Very Nice!
    Just so everyone knows, the original standard tail switch used a ball bearing with a tiny coil spring that is difficult to re-assemble.
    Having never taking my UTT tailcap apart your pictures show quite a bit of design progress compared to the original.
    Your mods are awesome, congrats!

    Quote Originally Posted by CRX_ View Post
    Here's a teadown of the HF-R Ti UTT switch that might help you.

    The resistor values in the switch are:
    92A – 887Ω
    201 – 200Ω
    150 – 15 Ω
    5R1 – 5.1Ω
    0 – 0Ω

    Couple of my HF-R Mods




  6. #6
    Enlightened CRX_'s Avatar
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    Default Re: HF tailcap fix?

    Quote Originally Posted by 2wenty View Post
    Thanks guys. Much appreciated.

    CRX, funny I was just looking at your lights on reddit. Awesome work. I was wondering how your momentary worked on the one with the MT-G2 emitter.

    Thanks. It is a custom hand made copper unit built into the 10250 section, the third GITD mark is the momentary switch button on both versions.
    It simply connects the battery to the flashlight body when pressed, bypassing the rotary switch unit.
    I also swapped some resistors in the switch as follows for better output levels and turning the rotary switch to the right now goes from high to low.

    Momentary mode – 760lm
    92A – 887Ω to 1Ω – 240lm – 20mins
    201 – 200Ω to 2Ω – 150lm – 40mins
    150 – 15 Ω to same – 30lm – 220mins
    5R1 – 5.1Ω to 200Ω – 10lm
    0 – 0Ω to 887Ω – 1lm
    Last edited by CRX_; 07-16-2018 at 06:30 AM.

  7. #7
    Enlightened CRX_'s Avatar
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    Default Re: HF tailcap fix?

    Quote Originally Posted by Got Lumens? View Post
    Very Nice!
    Just so everyone knows, the original standard tail switch used a ball bearing with a tiny coil spring that is difficult to re-assemble.
    Having never taking my UTT tailcap apart your pictures show quite a bit of design progress compared to the original.
    Your mods are awesome, congrats!
    Thanks. Good to know.
    Yeah I had been after one of these lights for a while and eventually managed to buy one second hand, one of my favorites now.

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