Intermittent Dropin, Surefire 6P

CRKDMike · Mar 23, 2020

So I purchased this host, pre bored for 18650 use. This is my first 6P.
I installed a Malkoff M61 in the head, and a flat top 18650.
After tightening everything as tight as I could with my hands, the dropin is still rattling around in the head, causing the connection to be unstable.
Something isn't right, but I thought that the M61N dropin was a plug and play solution!?
Is there something wrong with the host?

This is with the dropin installed, but no battery:

https://youtu.be/xFc9icAlWjU

And this is with the whole assembly:

https://youtu.be/LjqwTfnm9Us

archimedes · Mar 23, 2020

The boring may have reduced the necessary contact surface ?

Also, "flat-top" cells may often be too short for firm contact with the stock spring.

CRKDMike · Mar 23, 2020

Sorry about the duplicate thread, I wasn't sure how to delete the original, and I realized I put it in the wrong forum.

dotCPF · Mar 23, 2020

Wrap the dropin in alumnum foil, and stretch the spring a bit. Just give it a good tug, stetch it to 1/4-1/2" ~ish, or roughly 0.5-1cm..

I bet it's the spring isn't long enough without a button top.

CRKDMike · Mar 23, 2020

archimedes said:
The boring may have reduced the necessary contact surface ?

Also, "flat-top" cells may often be too short for firm contact with the stock spring.

Hmmm, ok but under regular circumstances with a bored 6p, and a button top battery, this should not happen, correct?

altermann · Mar 23, 2020

Amateur's boring service, contact place wasted after bofing

CRKDMike · Mar 23, 2020

dotCPF said:
Wrap the dropin in alumnum foil, and stretch the spring a bit. Just give it a good tug, stetch it to 1/4-1/2" ~ish, or roughly 0.5-1cm..

I bet it's the spring isn't long enough without a button top.

Ok so the tin foil worked without me having to stretch the spring! Thanks DOT!

Is this common? Is there not a less "makeshift" way to fix this issue?

CRKDMike · Mar 23, 2020

altermann said:
Amateur's boring service, contact place wasted after bofing

So it is a problem with the boring work? Where exactly did they go wrong. I got it on eBay.....

altermann · Mar 23, 2020

There red mark where exactly

CRKDMike · Mar 23, 2020

altermann said:
There red mark where exactly

Ahhh yes thank you.

archimedes · Mar 23, 2020

CRKDMike said:
Sorry about the duplicate thread, I wasn't sure how to delete the original, and I realized I put it in the wrong forum.

In the future, please just notify staff here (by PM or post) ... thanks

CRKDMike · Mar 23, 2020

archimedes said:
In the future, please just notify staff here (by PM or post) ... thanks

Will do.

archimedes · Mar 23, 2020

CRKDMike said:
Will do.

[emoji106]

CRKDMike · Mar 23, 2020

Thanks so much everyone.

badtziscool · Mar 23, 2020

I'm not even sure why this part was even touched. This area has no effect on the acceptance of an 18650 battery. Maybe it was modified for a larger P60 pill? Or maybe it was modified so it can accept the P60 kits that uses the large outer spring to make contact?

altermann said:

altermann · Mar 23, 2020

badtziscool said:
I'm not even sure why this part was even touched. This area has no effect on the acceptance of an 18650 battery. Maybe it was modified for a larger P60 pill? Or maybe it was modified so it can accept the P60 kits that uses the large outer spring to make contact?

You didn't get what exactly
I mean small "ring" which in contact with "-"

dotCPF · Mar 23, 2020

CRKDMike said:
Ok so the tin foil worked without me having to stretch the spring! Thanks DOT!

Is this common? Is there not a less "makeshift" way to fix this issue?

I wrap all my dropins to tightly fit in tinfoil. Better heat sinking that way.

"Common" isn't exactly easy to say. There's a bit of variance with all P-60 stuff. Surefire lights tend to be aimed at fitting those massive spring assemblies that are required in some dropins (from what I have been told at least) so they have a bit more room around the base on something like an M61 dropin.

CRKDMike · Mar 23, 2020

I just noticed that the bezel retaining ring is proud of the head. Could it be that the window has not been set at the proper depth within the head?
Should the bezel ring be flush with the head?

Grizzman · Mar 23, 2020

The bexel's lens retaining ring shouldn't extend beyond the front edge of the bezel, but that's not what's causing the lack of electrical contact

When the bezel is screwed onto the body, the inner lip that the bezel ring rests against should contact the front surface of the drop-in before the rear surface of the bezel reaches the raised shoulder of the body. If the bezel contacts the body shoulder, then the drop-in won't be fully secured in place against the body's drop-in socket.

This is only a problem when the body is modified incorrectly, or as has been stated, modified for a different type of drop-in than a Malkoff. An example of bodies with extra large sockets is Solarforce.

CRKDMike · Mar 24, 2020

Grizzman said:
The bexel's lens retaining ring shouldn't extend beyond the front edge of the bezel, but that's not what's causing the lack of electrical contact

When the bezel is screwed onto the body, the inner lip that the bezel ring rests against should contact the front surface of the drop-in before the rear surface of the bezel reaches the raised shoulder of the body. If the bezel contacts the body shoulder, then the drop-in won't be fully secured in place against the body's drop-in socket.

This is only a problem when the body is modified incorrectly, or as has been stated, modified for a different type of drop-in than a Malkoff. An example of bodies with extra large sockets is Solarforce.

Gotcha. Well the tin foil is working perfectly. I'm not in love with having to use this method but it works for now.
Would the copper ring that overready sells, work in the same way?

Intermittent Dropin, Surefire 6P

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