I copied-and-pasted this from another board I frequent, as I didn't want to type it again (one-finger typing is not terribly efficient). This is not my design, but was posted on an Australian site. Its author/ designer
encouraged others to copy the idea. So I did.
There's no originality here, as I shamelessly copied the above-referenced "anchor Angel" or "anchor friend", but I' thought I'd list the various components that I used to construct this home-made kellet. FWIW, it looks like this will work very well, and is definitely a good alternative to a $250 product, or rocks in a bucket.
I opted to go a bit heavy, as I am motivated to protect my T-48 as best as I can. I'm sure the main weight, and hence the other items, could be downsized somewhat, but I felt it was false economy to skimp here. As it was, I'm in this for only about $65.
A 35 lb free-weight (from a sporting goods store)
5' of 5/16 chain (I used galvanized BBB, from a local home-store)
3' of 1.5" ID reinforced water
hose (from the same store)
3 each 1/4" galvanized shackles
50' of 3/8" nylon as the control-line
The free weight is cast steel
, so I liberally coated it with rustoleum. Yes, it will still rust, and yes, plastic-coated would be better, but this is what I had to work with. Additionally, I couldn't find a plastic-coated weight greater than 25 lbs. YMMV
OK, run one end of the chain through the center of the weight. Shackle this end back onto the chain, forming a captured-loop (IOW, capture the weight in the loop of chain you just formed). Use as short a length of chain as you can for this.
Next, slide the hose over the +- 3' of chain remaining. Again, shackle the end of the chain (the other end this time) to itself, roughly where you attached the first end.
At this point, you have a figure 8...the bottom half is the weight, and the top half is the chain-in-the-hose, which has been looped to form a circle.
The basic kellet is now done. Time to connect the control-line. For this, I cut a 1.5" x .5" rectangle out of the reinforced hose. This hole is located at the apex of the hose-loop, on the outside bend. The purpose for this is twofold. Primarily, it allows you to work the 3rd shackle onto the chain inside the hose, so you can tie the control line to this new lifting point (I used a bowline for this).
2nd, it allows air, and thus unwanted flotation, to escape the hose once submerged.
That's about it. Everything stores in a space equal to the footprint of the weight, and can be stored below until needed.