I've been working with Blum undermount guides for many years and I consider them the best option, hands down, for drawer guides for 99% of cabinet designs. However, I am finding them to be deficient in one specific area that is causing me problems. The soft close mechanism is just weak. I understand all the factors that come into play here such as fitment of the drawer to the cabinet, accuracy of guide adjustment, weight of items stored in the drawer but, all those issues aside, these guides still don't close the drawer firmly enough to hold it closed in a definite closed position. This makes adjustment/alignment of the drawer fronts a real issue. I know they're supposed to close softly but, they should still close firmly enough to not cause problems.

Does anyone know of any fixes for this issue? I wish there were a way to adjust the guide to make the spring tension greater.