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Both my wife and I had 2xAZ earlier in the year, and a Pfizer booster last week. Had a bit of a sore arm for 24h, but no other side effects evident. Good luck!

The Joint Genie is a good tool - accurate and versatile - but I constantly find myself thinking that a few simple changes would make it so much better. Why not, for example, thread the transverse holes used to hold the shims? And why not supply proper thumbscrews for the end tabs (I’ve done...

That may work, but it’s designed for use with halogen lamps. Using it with LEDs is likely to make the lamps flicker. There are dimmers available designed for use with LEDs - often described as ‘Smart dimmers’. Here’s the first example I found...

Waterproof 22mm coated flooring chipboard (eg Egger Protect), laid as a floating floor over the celotex, with the t&g glued. Then your choice of floor covering. Works for me.

Router bit was my first thought. Bear in mind that they are intended to be used at (typically) 20,000rpm.

3 reasons, really. 1. Because I could, and partly because I’m still learning about 3D printing. 2. Because I needed to make a few copies, so having done the drawings, they would just chunter away on the printer while I did other things 3. Because I wanted to make one or two with a threaded...

They are printed in 4 pieces: two identical cheeks, each with a 63mm diam spout, and 2 spacers. The assembly is held together by 4 M4 screws and nuts. I made the slide from 3mm acrylic, with a 62mm hole cut with a holesaw. Printed on ‘fine’ (layer height ~0.2mm), the surfaces are pretty good...

+1 for that. Been there, got the t-shirt. I’ve made some 3D printed pass-through ones that work, but could use some more refinement. Happy to share the design.

Absolutely right. But the torque at the driven end of the shaft (the screwdriver handle) and that at the driving end (screwdriver tip) will be the same. Let’s simplify things, and consider a 1-dimensional case. Imagine a weight resting directly on a surface. The force at the surface is...

The GSHP hot water system is very much as you suggest - the heat pump circulates heated water through a heat-exchanger in the domestic hot water tank; this circuit is sealed. Domestic hot water is supplied from the tank; the legionella cycle raises the temperature of the water in the tank to...

The torque at the screwdriver tip must be the same as at the handle - unless the handle turns independently.

We too have had a ground-source heat pump for the last (nearly) 9 years, since building our house. Gas was not an option, as there’s no mains gas here. The house is ~270m^2, well-insulated, with underfloor heat throughout. We have 3 boreholes, in an area 5m x 5m, totalling about 210m of...

Zysa hinges https://www.hafele.co.uk/en/product/zysa-hinge-180-drilling-hole-10-24-mm/00000000000086a900010023/

Heisenberg and Schroedinger we driving on the freeway when they get pulled over by the highway patrol. The cop comes around to the driver side and says to Heisenberg, "Do you know how fast you were going?" And so Heisenberg says, "No, but I knew where I was". The cop scratches his head, and...

Paving slab(s) near the base, or a big lump of metal bolted underneath the bottom cross-members. And possibly lighten the top. In an earlier life, I built (prototype) medical equipment that had to comply with EN60601-1. That required a stability test that involved placing the device (think of...

Is English your first language?

As my old boss used to say “We usually frow those away.”

I have the Benchdogs track square, and found it works very well. Suggest a look at some of @petermillard’s YouTube videos. I found them very helpful when I was setting off down this rabbit-hole!

Here’s the reference: https://www.wealdentool.com/cgi-bin/sh000001.pl?WD=aluminium&PN=Aluminium%2d2%2dFlute%2dUpcut%2ehtml#aNGU06320063

Wealden (and Trend) do router cutters specifically for cutting Al. The edge profile is different from that of wood-cutting bits to reduce swarf sticking to the bit. I’ve not used them, but…