what is the internal locking screw for- do i need to do anything to it ?

I assume you are referring to the small screw in the side of the housing. This is for termination of the earth wire. Because the housing is metal you MUST use 3-core wire and terminate the earth in the switch body. Without an earth connection there is a very high risk of electric shock when switching the light on or off. 2-core wire is only suitable for use with and ALL plastic housing.

Will this 10mm fitting screw onto the 1/2 inch rod which goes through the lamp base?

No, you will need to order the 1/2" inch entry lamp holder.

What are 'plunger contacts' ? Previous, broken fitting has screw contacts.

Plunger contacts interface with your bulb. There are screw terminals fitted for your flex.

Will this 10mm fitting screw onto the 1/2 inch rod which goes through the lamp base?

No - you need a 1/2 inch lamp bulb holder a 10mm will not fit

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ElekTek Special Safety Switch Lamp Bulb Holder B22 BC Bayonet Shade Ring, 10mm/M10 x1 Bottom Entry, Brass, Child Safe Switch Push Bar Locks Off to Cut Power if lamp Bulb not Inserted - Made in UK

ElekTek Special Safety Switch Lamp Bulb Holder B22 BC Bayonet Shade Ring, 10mm/M10 x1 Bottom Entry, Brass, Child Safe Switch Push Bar Locks Off to Cut Power if lamp Bulb not Inserted - Made in UK

Product ID: 51157296

Details

Brand
ElekTek
Colour
Brass
Material
Brass
Mounting type
Wall Mount or
Product dimensions
32W x 63H

⚡Only powers on with bulb fitted

🔒Patented push-bar safety switch

🛡️Solid brass UK-made durability

EC$95

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Description

🔌 Light up safely, stylishly, and smartly with ElekTek’s brass brilliance!

CHILD SAFE POWER CUTOFF - Switch disables automatically when no bulb is inserted, preventing accidental shocks.
PRECISION THREAD SIZING - Available in 10mm (M10) or 1/2" (26 TPI) bottom entry to perfectly match your lamp’s threading.
PREMIUM SOLID BRASS BUILD - Crafted in the UK for unmatched durability and timeless style in your lighting fixtures.
CERTIFIED SAFETY HEAT RESISTANCE - BS 7895:1997 approved with T2 rating (220°C) for reliable, long-lasting performance.
UNIVERSAL B 22 BAYONET COMPATIBILITY - Seamlessly fits all B22 bulbs—LED, halogen, or incandescent for versatile use.

The ElekTek Special Safety Switch Lamp Bulb Holder is a UK-made, solid brass B22 bayonet lamp holder featuring a patented push-bar safety switch that cuts power when no bulb is installed. Designed for child safety and durability, it supports all B22 bulbs and comes in precise 10mm or 1/2" threaded bottom entry sizes. Certified to BS 7895:1997 with a 220°C temperature rating, it ensures safe, reliable lighting control for modern homes.

Specifications

ASIN	B01DJBMNLU
Base Type	b22
Best Sellers Rank	1,888 in Lighting ( See Top 100 in Lighting ) 883 in Indoor Lighting
Brand	ElekTek
Colour	Brass
Country Of Origin	United Kingdom
Customer Reviews	4.4 4.4 out of 5 stars (774)
Included Components	Bulb, Power Cable, Shade
Item Dimensions W x H	32W x 63H millimetres
Manufacturer	ElekTek
Manufacturer Part Number	L003
Material	Brass
Mounting Type	Wall Mount or Ceiling Mount
Number of Items	1
Number of Packs	1
Unit Count	1.0 count
Voltage	240 Volts

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EC$95

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Saint Vincent and the Grenadines.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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