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22.5 degrees is for an octagon. 30 degrees for a hexagon.

We’ve had a GSHP in and working for nearly 10 years, routinely serviced. No need to replace the propylene glycol solution in the ground loops. The service engineer just checks the concentration with a refractometer as part of the service. A lot of myths around!

Drill around the offending screw with a hollow drill. Something like this: https://www.amazon.co.uk/gp/product/B07T4Y3CMJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 then remove the remains with fine-nosed pliers. Alternatively, @Inspector has it right!

No matter what paint system you use, if the resin from the knots expands under the paint, it will eventually break through. The only perm solution I’ve found - for anything but the smallest knots - is to drill a shallow recess into the knot and plug with clear timber. A bit tedious...

Thanks @MikeK - that’s really helpful. I don’t have the Incra plate, but I can 3D print some vented inserts for my table. - Geoff

Mike, Can I ask a bit more about the air inlet. Is that a separate vent from the side of the box, in line with the spindle, or just the leak through the top plate? TIA Geoff

I have one of the 2-motor Camvac extractors connected to a (63mm) duct system with blast gates. Very happy with it, more so since I added the silencer box shown in the Hooked on Wood video linked above.

How about a length of aluminium rectangular section tube?

You’ve got 2 choices: do some trigonometry to calculate the dimensions and angles of the pyramid that defines the intersection of the two backs; or fit one right into the corner and scribe the other one to it.

A slightly different router jig from what the OP suggests. Still 2 parallel guides, but separated by 30mm. Use with a 30mm guide bush on the router, and the appropriate size cutter for the wid of housing required. Simple, of course, to do stopped housings too. Agree with Pete that clamping...

Polyvine wax-finish varnish. Minimal colour change, dead easy to apply, and durable.

We have two bifolds, one 3.6m in 4 panels, the other 4.5m in 5. They’ve been in for a bit over 9 years, and aside from some adjustments over the first year (as the house settled), they’ve worked well, only needing an annual clean of the track and gaskets. The smaller one is arranged as 1+3...

IIRC, I bought my (smaller) Camvac extractor from D&M tools - D & M Tools Search, who offered the same price as Record, but free delivery over £99.

I’ve got one of the smaller, 2-motor CamVac units (336-4 iirc). Very satisfied with it. I use it connected to fixed 63mm duct, with table saw, router table, sander, drill press, and also with hand-held power tools. Plenty of suck. I’d guess with a planer, you might want to use a 100mm duct...

Works even better if you connect the wire to the mains!

M12 is awfully big!

That’s the universal answer to difficult questions: “Use ethanol!” I know I do!

Endorse all the comments above. Good quality bits undoubtedly help - Wealden is my normal starting point (Wealden Tool Company Limited). From your description, you are cutting in the right direction - @Spectric ’s drawings lay it out clearly. As @clogs says, softwood endgrain is always...

This is almost certainly a flanged oilite bush - sintered bronze, impregnated with oil. bearingboys.co.uk bearingshop.co.uk simplybearings.co.uk all list a variety of flanged bushes.

(Dredges darkest depths of distant memory) #define begin { #define end } 20 years since I wrote any ‘C’, and I’m sure it shows!