Each block is 21mm in height and you always need an odd number of Stackers on each side to make up a box frame. The minimum required number of blocks is 3 on each side to make up a 63mm (2.5") tall frame.
The most efficient way of purchasing these blocks is as a pack which you can find here: https://mattestlea.com/products/stackers
Use this product to top up what you've got or to help make irregular shapes (although they will be coming as packs in the near future too).
How do they work?
Slot the Stacker Blocks (the one with the hole running through it) onto the frame clamp rods before the frames are built.
Put together all the frames in their entirety (but don't stack them yet), roughly to the size of the box you'll be making.
Attach the magnetic Stacker Spacers to the Stacker Blocks.
Place your next frame with the Stacker Blocks already applied on top of those Stacker Spacers.
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Han v.V.
A week well spent
I had an absolute blast during the keepsake box course. Having followed his YouTube tutorials, I expected a similar experience, and that’s exactly what I got, but better. While the video's go into greater detail, being able to ask questions in person after the inevitable is invaluable. The class moved at a perfect pace so explanations came right when we were ready. Matt is a patient teacher, always up for a laugh.
The course also gave me much more confidence with hand planes (prior to this week I was quite traumatised) and showed me how to recover from mistakes without panicking.
Bonus: it’s the perfect chance to try out Matt’s tools if you’re thinking of buying any. Much to the chagrin of my wallet I greatly enjoyed using them!
All in all, it was a week packed with learning, laughter, and enough sawdust.
The Keepsake Box Course (30th March - 3rd April 2026)
Mark S.
This was an incredible course
This was an incredible course. Matt shared so much knowledge and massively improved my confidence with hand tools.
The Keepsake Box Course
Patrick d.B.
Super quality engraved coin
I normally don't write reviews, butin this case I have to make an exception 🙂. I have just received my custom emblem coin. When I opened the box I was amazed by the result. Super quality. Perfectly engraved. The background ( in my case the wood texture ) was very beautiful, the logo was very clear and even the small letters were very easy to read. I will definately order more when I need them, and I recommend the coin to everybody. If you want superior quality, you will find it hete. You will not be disappointed.
Custom Engraved Brass Emblem Coin
Andrew V.
Excellent course in every way
This was such a good course. Matt is an excellent teacher with a really great balance between when to help and when to leave you alone. We made such good progress that we even got to make a bookstand as an extra. While the odd machine was used for convenience the whole box was really a hand tool build as every machine step had a hand tool alternative.
I cannot recommend this highly enough for beginners and those wishing to improve their joining and hand tool skills. And Matt is so obviously a decent person who cares about what he does. I would happily do another course with him.
The Keepsake Box Course (20th April - 24th April 2026)
Marco W.
Very rewarding experience
Matt is a wonderful teacher. He’s very patient and takes everyone’s needs into account. He and his team are a lively bunch. You feel right at home and valued from the very start—regardless of your skill level. The workshop is superbly equipped, and the working environment is simply perfect for learning a lot in just one week.
Definitely my best and most memorable experience last year. Thanks again for this very rewarding week, Matt and team.
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