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Sorry - any mention of ropes and pulleys reminds me of that....

In telecommunications it's not unusual for circuits carrying just signal levels to also have a DC voltage or 'wetting current', usually limited to a few miliamps, applied to them, for a variety of purposes:- It mitigates the effects of oxidation in cable joints and plug/socket connections...

It might be worth having a look at http://www.contour-showers.co.uk/

Given the age of the property, built before public water supplies were common, was the chamber the rainwater runs into originally intended for disposal of waste water, or as a well for domestic water?

M7 is not a preferred fastener size. Most fixings for handles (or almost anything else, for that matter) use 4, 5, 6, or 8mm threads. Older imperial sized 1/4" threads would be about 6.4mm, but it is unlikely you would find them on anything made in the last 25 years. The hole is probably...

If both live and neutral are present at the switch, then an immersion heater timer, or a single channel heating programmer would do the job.

Is your bath / shower mixer fed directly from the mains supply (via a combi boiler or unvented cylinder), or is it fed from a cold storage cistern in the loft and a vented hot cylinder? If the latter, the mains pressure and flow rate are immaterial to the problem.

As above, use a seperate valve linked to the flexi with a short length of pipe. You will appreciate the virtue of using a seperate iso. valve when the first part to fail is the flexi.

A check valve in the hot feed to the mixer would stop it happening again. (And one in the cold supply to stop backflow and potential water supply contamination if the mains pressure drops)

Indiscriminate application of eddy current braking could result in arbours etc. unscrewing with the inertia of the wheel, potentially releasing a rapidly spinning grinding wheel to bounce around the shop a few times. I have heard of a similar accident when the reversing switch for a 3-phase...

:? That would mean the both lights would stay on at half power until you operate one switch, which would affect the light you would expect to be controlled by the other switch. OP - it sounds like you have intercepted the wrong cable. Identify which wiring method has been used for your...

Some valves will leak water around the handle as they are turned, but seal again as soon as they are fully 'on' or 'off'. Sometimes the rubber washer in the hose connector gets omitted or lost, allowing water to leak around the hose union threads. You should be able to fit a new valve onto...

So far everything sounds a bit farse about ace to me. The problem is not that the hot water pressure is too low for the tap, it is the tap presently fitted is unsuitable for use on the low pressure hot water system you have. Try changing the tap for one that is suitable for a low pressure...

Get yourself one piece of slate, a floor or wall tile or a piece of stainless steel of your choice. Carefully drill it to take the shower valve of your choice, then fix it over the mess left after removing the electric shower with a mirror screw in each corner.

'Horizontal' waste and soil pipe runs are usually set up with a 2.5° fall - that's why many bends etc are 87.5°, not 90°. Core drilling will be difficult, if not impossible, if the new and old holes overlap to any great extent. Consider removing a brick (looking at the pointing, that may have...

It may be easier to cut out a square of plasterboard around the fittings, and replace it with a new piece. After all, it will be out of sight behind the cistern. If you do, fit a decent sized noggin between the uprights to screw the cistern to as well as support the edges of the plasterboard.

How about a corner branch laid on it's side, one branch through the wall, t'other pointing skywards, the 'bottom' to the right and the unused 'top' connection plugged? An AAV isn't always a viable alternative to an open vent stack. They don't relieve positive pressures, so they can lead to...

The answer is 'Stratification'. The amount of water in the hot cylinder is constant. Gravity causes cold water from the cold storage cistern to run into the bottom of the cylinder as hot water drawn off from the top. If it didn't, the cylinder would have to collapse like a punctured...

One form of stud extractor is an 'Easy Out', a form of tap with a left hand thread. Drill an appropriate size tapping hole, and the extractor unscrews the stud as it tightens into the hole. Stud boxes can be locked onto the projecting part of a stud or broken bolt, and used to unscrew it...

Some of the problems :- For water to flow from the cold cistern to the hot cylinder there must be a pressure differential between the two, so the water level in the vent pipe will drop when you start to draw water, and will probably starve the pump. Teeing the pump cold feed from the...