I notice that more recent weights all use Velcro to close them, and I certainly understand why, since the earlier version which I have slips loose in the middle exercises and is also very difficult to adjust. Do you know of any adaptations to the original weight holder (replacement Velcro straps, for instance), or if it's possible to buy just a new ankle weight holder?

I am assuming that you have the Keiser ankle weights. These weights, developed by Dr. Nelson in conjunction with Keiser Equipment, provide an alternative for consumers to the existing progressive ankle weight on the market. Since that time, we have received feedback from other readers similar to the experience you report. We suggest that you contact the manufacturer and request a replacement pair or a refund if this equipment is not working properly.

It is a big investment of money and time. We have had good experience with the All Pro weights, although all ankle weights are a bit cumbersome and tend to "slide", particularly at the heavier weights.

We hope this information is helpful to you. Best wishes for continued success with your exercise program.