I have the full intention of using an additional ball bearing block to wrap the sheet more effectively around the racket block, just trying to get some opinions about which block is better, i know some people are saying harken are better, but the ronstan block are claiming a 2 times greater holding power of 20:1 compared to the harkens 10:1, i know theres a lot of other variables such as the quality and reliability of the product, which is my major concern (holding power can be increased by simply going to the gym), but ive always considered ronstan to be a good product, i know a few people have complained about them, however im just looking for some more opinions about peoples experience with them.

Thank you.
Michael.