Neck Weight v2 — Belt Loop Modular Weights on Collar

Proven

Soft lead-filled collar from V1, plus an adjustable 60 mm belt with modular 500 g weights that hangs down the back.

Example setup (your numbers may vary): - Collar: ~3.5 kg lead-filled tube - Collar loop + buckle: ~0.5 kg - Belt weights: 3 × 500 g = 1.5 kg - Total: ~5.5 kg

Reference images

Collar closed	Collar open

Components laid out	Belt with weights and stopper	Finished collar with back-hanging belt

Time needed

Technique	Implementation	Waiting
Creating the Neck Collar Creating the neck collar	0.25 h	0 h
Creating the Modular Weights Back-hanging modular weights ×3	0.25 h	0 h
Total	0.5 h	0 h

Bill of Materials

Technique	Material	Quantity	Unit Cost	Line Cost
Creating the Neck Collar Creating the neck collar	Bike Inner Tube 26" Consumable	0.4 tube	£6.49 per tube 26in	£2.60
	Loose Lead Consumable	3 kg	£8.50 per kg	£25.50
	Quick Side Release Buckle 50mm Consumable	1 unit	£6.00 per buckle	£6.00
	Electrical tape roll Consumable Wide PVC tape to join acrylic seams	1 roll	Inexpensive
Creating the Neck Collar total				£34.10
Creating the Modular Weights Back-hanging modular weights	Bike inner tube (loop) Consumable Small loop that clips to the neck-collar ring	0.3 tube scaled ×3 — base 0.1 tube	£6.49 per tube 26in	£1.95
	Quick-release buckle (60 mm) Reusable Connects the collar loop to the belt	1 buckle	£2.50 per 60 mm quick-release buckle	£2.50
	Weight belt (60 mm) Reusable Carries the dive weights	1 belt	£9.00 per 60 mm nylon weight belt	£9.00
	500 g dive weight Reusable Belt-mountable lead weights	3 weight	£10.00 per 500 g lead dive weight	£30.00
	Slide stopper (60 mm) Reusable Locks the stack of weights from moving	1 stopper	per 60 mm slide stopper
Creating the Modular Weights total				£43.45
Consumables subtotal £36.04	+	Reusable subtotal £41.50	=	Grand total £77.54

Tools Required

Tool	Techniques	Purpose
Funnel	Creating the Neck Collar	To channel the lead into the tube
Gloves	Creating the Modular Weights	Keep hands clean while handling lead weights
Scissors	Creating the Neck Collar Creating the Modular Weights	Cut materials like fabric, film, or templates to size Trim inner tube and tidy belt tape ends if needed

Instructions

1. Build the soft neck collar following Creating the Neck Collar; target ~3 kg filled tube with quick release.
2. Assemble the modular back belt using Belt loop weights; start with three 500 g weights on a 60 mm belt and slide stopper.
3. Clip the belt’s quick-release onto the collar loop, hang the weights down the back, and adjust count/position for comfort and buoyancy.

Notes

• Total weight is now split: fixed collar mass + adjustable belt weights; easy to reuse the belt weights for depth diving.
• Ensure all buckles/stoppers are 60 mm to prevent slip.