Kef 107 woofer refoaming question

I have 20 yr old KEF 107 speakers which needs bass driver refoaming. The surrounds and donuts are said to last about 10 to 15 years. I can get the refoam kit and do it myself. It is the most cost effective way ($80). Anybody have any experience with refoaming these speakers? If anyone did, is it recommanded? How do I take the woofers out of cabinet? Do I take one out from top and another from bottom of the cabinet?

If not recommanded, I will have to let the pro shop do it for $470.

Steve