Another Problem with Convoy M21B

11 posts / 0 new
Last post
zoulas
zoulas's picture
Offline
Last seen: 26 min 33 sec ago
Joined: 06/01/2020 - 08:35
Posts: 1287
Another Problem with Convoy M21B

Light just purchased. The tail-cap and/or switch seems intermittent. When I click it on , sometimes it works sometimes it doesn’t. While its on, it may turn off by itself. Clicking through the modes, does not always work. When it turns off on its own, tapping on the tail cap seems to solve the problem.

I am all for low prices, but these Convoy Q/C issues are really getting annoying. I would gladly pay an extra $5 per light and not have these random issues.

ShyOne
ShyOne's picture
Online
Last seen: 6 min 7 sec ago
Joined: 08/08/2019 - 23:23
Posts: 116
Location: Cortez, FL Cuchara, CO Homeport..AL

Check the retaining ring in the tailcap and make sure it is tight.

RobertB
RobertB's picture
Offline
Last seen: 15 hours 46 min ago
Joined: 12/18/2015 - 17:49
Posts: 3618
Location: USA, Michigan

Never had any problems with Convoy’s that couldn’t be fixed easily.

zoulas
zoulas's picture
Offline
Last seen: 26 min 33 sec ago
Joined: 06/01/2020 - 08:35
Posts: 1287
ShyOne wrote:
Check the retaining ring in the tailcap and make sure it is tight.

How do you tighten it? Any special tool?

Jack Kellar
Jack Kellar's picture
Offline
Last seen: 5 hours 41 min ago
Joined: 03/09/2014 - 14:21
Posts: 2073
Location: Throwing bolts at anomalies

You can use snap ring pliers (I don’t recommend using any kind of tweezers, they can’t stand the torque you need to really tighten that ring). Just mind that the threading on the retaining ring is reversed, i.e. it screws in counterclockwise.

ShyOne
ShyOne's picture
Online
Last seen: 6 min 7 sec ago
Joined: 08/08/2019 - 23:23
Posts: 116
Location: Cortez, FL Cuchara, CO Homeport..AL
zoulas wrote:
ShyOne wrote:
Check the retaining ring in the tailcap and make sure it is tight.

How do you tighten it? Any special tool?

See those two little holes (opposite each other) in the retaining ring… Insert snap ring pliers into those and make sure the ring is snug.

You can also use needle nose pliers if the tips are small enough.

Tweezers will work also, just don’t over torque it past what the tweezers can hold up to.

Hope this helps. ✔️

zoulas
zoulas's picture
Offline
Last seen: 26 min 33 sec ago
Joined: 06/01/2020 - 08:35
Posts: 1287

Ok, thanks gents.

ShyOne
ShyOne's picture
Online
Last seen: 6 min 7 sec ago
Joined: 08/08/2019 - 23:23
Posts: 116
Location: Cortez, FL Cuchara, CO Homeport..AL
zoulas wrote:
Ok, thanks gents.

Our pleasure… Let us know if that was it.

Funtastic
Funtastic's picture
Offline
Last seen: 5 hours 54 min ago
Joined: 06/26/2014 - 02:14
Posts: 1796
Location: New Zealand

For years I just used two small nails I cross over and twist. I still do that if the holes are too small on some models

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

PeyoX
PeyoX's picture
Offline
Last seen: 6 hours 1 min ago
Joined: 04/12/2021 - 00:47
Posts: 11
Location: 0274
Jack Kellar wrote:
You can use snap ring pliers (I don’t recommend using any kind of tweezers, they can’t stand the torque you need to really tighten that ring). Just mind that the threading on the retaining ring is reversed, i.e. it screws in counterclockwise.

Wait, not all convoy’s had reversed thread. There are some with clockwise thread. I think the reversed thread only for S series, CMIIW.

Limited English, still working on it.

pennzy
pennzy's picture
Offline
Last seen: 4 hours 53 min ago
Joined: 12/10/2017 - 19:45
Posts: 3303
Location: United States , Pa.

One other thing to check is good battery contact. I’m not sure about your model but my M3-C has a very long battery tube. I had to stretch the tail spring to make good contact.