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Essential Testing

It essential that products designed to protect people and property undergo thorough testing. The staff at SJH Projects have carried out many explosive trials in the process of product development. We can help you exploit this experience to bring your own products to market.

The process starts with a consultation in which the end use and market sector requirements are discussed. Advice is then given on what level of testing, and where necessary, what formal test specifications should be followed. Liaison with the test ranges is then undertaken and all the planning other than test item manufacture is carried out on behalf of the customer. If required, the test footage/photos and data can be edited into a short movie or clips for presentations to potential customers.

Blast Testing

We have carried out a wide variety of blast test using the appropriate specifications for the industry or application at hand. SJH projects can also assist in designing your test configuration and the test rigs themselves. Test management, data and imagery processing and detailed reporting can be provided to fully support the customer’s needs.

Ballistic Testing

SJH Projects can also arrange ballistic tests and assess product durability appropriate to the intended use.

For those interested in the artistic side, historical watches often featured highly decorative, hand-engraved balance cocks (sometimes called "watch cocks"), which are now prized by collectors as miniature works of art. How to fix balance wheel movement issue? - Facebook

: The most delicate step is ensuring the upper pivot of the balance staff perfectly enters the jewel hole in the cock. If the screw is tightened while the pivot is misaligned, the staff will break.

The balance cock is a cantilevered bridge, typically secured to the watch's mainplate by a single screw. It serves as the upper support for the balance staff—the axle upon which the balance wheel oscillates—enabling the watch to keep time.

: It holds the upper pivot of the balance wheel in place. Because it is only anchored at one end (cantilevered), it allows for easier visibility and adjustment of the balance assembly compared to a full bridge.

: The balance cock also holds the "stud" (the fixed end of the hairspring). Ensuring the hairspring is flat and centered under the cock is essential for accurate timekeeping. Types of Cocks in Watchmaking

Test Limbs

SJH Projects has become the distributor for the NATO approved ‘Frangible Surrogate Leg’ for fast event impact testing. We also provide the ‘Frangible Surrogate Headform for blunt trauma and ballistic testing.

Latest News

Amateur Cock -

For those interested in the artistic side, historical watches often featured highly decorative, hand-engraved balance cocks (sometimes called "watch cocks"), which are now prized by collectors as miniature works of art. How to fix balance wheel movement issue? - Facebook

: The most delicate step is ensuring the upper pivot of the balance staff perfectly enters the jewel hole in the cock. If the screw is tightened while the pivot is misaligned, the staff will break. amateur cock

The balance cock is a cantilevered bridge, typically secured to the watch's mainplate by a single screw. It serves as the upper support for the balance staff—the axle upon which the balance wheel oscillates—enabling the watch to keep time. For those interested in the artistic side, historical

: It holds the upper pivot of the balance wheel in place. Because it is only anchored at one end (cantilevered), it allows for easier visibility and adjustment of the balance assembly compared to a full bridge. If the screw is tightened while the pivot

: The balance cock also holds the "stud" (the fixed end of the hairspring). Ensuring the hairspring is flat and centered under the cock is essential for accurate timekeeping. Types of Cocks in Watchmaking

Pressure Chamber

Under Pressure

We have recently completed the design phase for a novel blast/pressure containment vessel. This will allow the customer to perform research and proofing of their

February 8, 2026

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In Bruges

Steve Holland of SJH Projects participated in PASS 2025 ( The Personal Armour Systems Symposium) in Bruges in September. PASS is the premier technical event

October 2, 2025