I agree with Glenn completely.
I recently updated my old AR3a rebuild post from 2012, because the original pots I thoroughly cleaned and reused had failed once again, after only 4 or 5 years. I had also replaced the woofer's foam surrounds, and rebuilt the crossovers.
This time, however, I decided to purchase the pots currently being sold on eBay by "capatianfantastic07" instead of once again dealing with the original and problematic pots, only to risk them failing again very soon. Beginning on pg. 5 of the post (here: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/7440-upcoming-ar3a-project/), I documented the installation of these new pots. They are a drop-in replacement, and don't require any modifications to the crossover networks, or cabinets. Yes, they're a bit pricey compared to L-Pads for sure but, I still wanted to maintain them as close to original as possible.
I couldn't be happier with the results, and installation was very straightforward and simple. I did need to make a couple of creative decisions as to how they should be installed, because of the tabs, and threaded mount differences - you can read those observations in my post. Nothing anyone else couldn't have done on their own.
Also, Chris rebuilt my tweeters this time. One was effectively dead. Like others here, I can attest to the quality of his work, and tell you you'll be very happy with the results. It's no wonder they still command such a high value on the vintage audio market.