Weight method with the Magnet connector.
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I use a steel bolt to keep the washer in a convienant stack ( no tape on washers for photo)
What is nice about using a bolt is the head of the bolt does not create a large surface contact area against the magnet. The magnet I am using can hold 70lbs and when its stuck to a flat metal surface it is very hard to remove.
Just type "Neodymium Round base magnet" in any search engine and you will find them. The price is about $3 to $6 depending on where you order from.
I will not be selling the magnet
but I will have the screw+post/connector available on the parts page.
The screw post is made from aluminum and the screw is stainless steel. #8-32 3/4 inch long.
I just stick the screw through the hole in the magnet...
Drop the Scew post into the retainer...
Now I will just put my finger against the post so that I can start the screw with my fingers on the other side. Then use a screw driver to tighten things up.
The screw lines up with the screw post and now all that is needed is to tighten the screw to the post.
Now the screw driver tip will want to stick to the magnet so this is the only tricky part. It really is very easy to do this since your just screwing a screw into a post.
I used a magnet that can be found online, Amazon, Ebay and many other sites on the Web or hardware store.
Now when its done it should look like this. Please keep in mind these magnets are very strong. Try to avid attaching them to any flat metal surface because they are extremely hard to pull off.
I have used the Magnet set-up for many weeks with out any issues.  I also had a phone in my pocket and it did not interfere with it at all but just take precaution as you would with any strong magnet next to an electronic devices.
I found a much easier way to add weight to a DTR or Retainer using a High powered magnet. 
The large connector is for the DTR bell and small connector is for the Retainer.
DTR size
Retainer size
 I find the Retainer to be more compact then the DTR when using weight but  I can use a magnet on either.
Steel ball bearings can be used as weight.  This does provide a more compact weight. This 2 inch ball provides over 19 oz of weight.

WARNING !!  Do not take what you read and see on this site as instructions.I am only showing this to everyone because I had requests to show how  I can attach a magnet to the device.
ANY time weight is used please remember that there is a possibility of the device coming off do to GRAVITY.   Use your own judgment on how much weight you are using !
Thread  lock can be used to decrease the chance of the screw loosening.
I am using a 2 inch steel ball in this picture. This is about as much weight as I feel comfortable using. I could use much more but I do not want to chance damaging my foreskin.
1 inch ball... 8oz
2 inch ball... 19 oz
These magnets can be very strong so take precaution as you would with any strong magnet.
So where did I get these.... not Amazon !
https://www.bcprecision.com/