The Iceni Audio Ltd. counterweight is in.
I am very happy with the chance I took on this little known aftermarket counterweight. The fit and finish are better than the picture on ebay indicated. It is totally adjustable and able to accommodate a wide variety of cartridge weights. Oh, and did I mention the price is right?
The only competitors, IMO, are GrooveTracer and Michell, both of which cost 2x's or more the cost of this. If you have a Rega based arm and looking for an upgrade this is by far the best value around