When I purchased my first concertina 6 months ago, I chose Frank because he offered a package of instructional materials (DVD and books) with his beautifully made instruments. Like many in remote locations I have no local teachers or workshops to rely on so I started from zero.
Recently I noticed on my RH wooden end the finish was slightly scuffed right next to the hand bar. I emailed Frank and he suggested it was probably from the tips of my fingers, even though I keep my nails short. This makes perfect sense because I realize that I had the straps to loose and instead of keeping my fingers on the home row (like his book suggests), I had a "death grip" on the hand bar of my dominant right hand.
I sent the concertina back to Frank where he touched it up at no charge. Not only was this a great gesture despite my own ignorance, he taught me an important technique point especially for wooden ended concertinas.
I heartily recommend Frank Edgley for the quality of his work, his experience as a player, and his availibilty of instruction materials.