We will be closed 19th June 2021 - 28th June 2021

CustomDUO Shop

Bargain Bazaar


Other random bits and pieces !

Clear Plastic Lamp Window

Machine cut window, manufactured in UK. 69mm diameter, 5mm thick, 6 equally spaced holes for m3 clearance on circ 61mm PCD. Ideal for self build caving light. 



69mm Front Window

CustomDUO Shop 

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The Online Shop allows payment with most debit and credit cards, without the requirement for a Paypal account. Add product to cart and option is offered at checkout. Customduo also accept UK cheque or bank transfer.  International orders welcome. We are currently shipping internationally (outside UK) at no extra postal charge. For more details please see delivery


Please note that we are a small manufacturing business. Officially we work Mon-Thurs (excluding public holidays). If closed for holidays etc we will provide notice on CustomDUO calendar.

We aim to despatch CustomDUO stock products within two working days, and generally the next working day. We make every effort to keep our on-line stock availability right up to date (and generally don't get caught napping). When placing an order, please ensure that your delivery details are correct, and also that your email address is current, so that we can keep you informed on order progress.


Before purchasing any Customduo product please ensure that you have read and accept the terms

Sump Donkey Heatsink

Dusk Runner - bonkers !!

Ultra light weight runners wrist light, only 6g. Bizarre thing built mostly to see what can be achieved with latest low power SMD LEDs and cr2032 battery.  Including mens 20mm velcro wrap around adventure sport style watch strap. more info




Sorry, out of stock




Clear Plastic Square Window

Machine cut window, manufactured in UK. 50mm square, with 4 holes, for alloy project boxes of same size (50h x 50w x 20d). Project box not included.



50mm Square Window

3 x AA battery holder

Sick of troublesome plastic AA holders with poor battery fitment and gash coil spring connections. Nora 3 x AA battery holders, 3.6-4.5v nominal. Fits Petzl Zoom box !! Comes with JST connector, but easily adaptable to your requirement.



Nora AA Holder

Voltage Gizmo

Quickly check state of charge / discharge of li-ion battery packs. Fitted with JST connector to suit 3.7 v battery packs such as Rude Nora (4.2v charged / <3v discharged). Can also be used for series wired packs. E.g. 2s 7.4v packs such as Scurion (8.4v charged / <6v discharged). Handy if wishing to store battery packs part charged !! Maximum voltage 30v.  




AA 'Expedition' battery holders for Scurion caving lamps

Works with the regular Scurion caving lamp battery box. Useful option for back-up, or expedition where charging could be problematic, or when your li-ion batteries have been confiscated at airport !! No return clearance item. Discontinued. more info


£14   Sorry, out of stock


Stenlight Battery Pack 

Anodised aluminium alloy battery box (original Little Monkey box from 2008) with protected 7.4v. li-ion cell pack, chunky 4.6mm diameter cable, and connector suitable for Stenlight. Robust replacement for original heat shrunk packs. Sealed design, waterproof, but be aware that water could potentially track along cable over time, as Sten lamp and battery connectors are not waterproof. Fixed to helmet with shock cord. Weight approx 175g. 


£45 - £65  (limited stock)


Have a few in stock - UK delivery only (too expenisve to post internationally) 

18650 underground battery container 

Edna rude tube !! Robust, water tight battery container (aka bottle preform), useful for underground transportation of 18650 battery. Mixed colours (black, yellow, green, blue).


18650 battery container

Fleabi Modules

Multi purpose bi-pin and MES (mini edison screw) LED units, featuring SMD and Cree XP-G LEDs. Clearence, mostly sold out. more info


Sorry, out of stock

Sump Donkey Heatsink for Diving Canister Light

Custom machined, solid aluminium heatsink from now discontinued Sump Donkey LED module for Diverite cannister lights. Would suit DIY LED conversion of diving cannister lamp. Diameter 35mm x 35mm long, 7.5mm dia. bore. Bare heatsink, LEDs and current regulation circuitry etc not included.  Well suited to designs incorporating 35mm triple LED optics. No return clearance stock, while available. 



18650 DIY Battery Pack Kit (3.7v)  

Simple DIY parts kit for assembly of 3.7v li-ion battery pack from single unprotected 18650 battery. Can be used with Filthy Edna / Rude Nora or similarly configured caving lights. Kit includes simple 6A protection circuit, well suited to DIY use, with nickel plated strips that can be spot welded or soldered to battery. Kit also includes RC connector on silicone leads, heat shrink sleeve, self adhesive battery end insulators etc, necessary to finish battery pack. Soldering not considered best practice, exposure to heat should be minimised to avoid potential damage to battery! 18650 battery not included.  



18650 DIY battery pack kit

'Lil Monkey' 1x18650 battery box (fitted battery optional) 

'Lil Monkey' alloy battery box / tube. Anodised black or matching Blind Bat purple, as available. Suitable for wiring in 1 x 3.7v 18650 li-ion cell (protected or unprotected depending on application). 4 core cable, length 200mm, with waterproof connector and stripped wires. Wiring protocol, red & green +ve, black & blue -ve.


See Blind Bat

Nora Battery Charge Gizmo