Ooops

Imagine if you will, that one of your ceiling downlight LED spotlights has stopped working after 5 years faithful service.  Off you go to get a replacement light only to learn that the manufacturer has discontinued that model and replaced it with a new and improved model.  LED spotlights were relatively new things 5 years ago and designs move on.  Unfortunately the new model requires a slightly bigger hole to be created in the ceiling....

The simple job of replacing a bulb just got more complicated.

Creating the enlarged hole and ensuring that it lines up with the other lights is much more difficult than you might imagine.  The usual hole saw requires you to drill into the ceiling at the central point of the proposed hole, but you cannot do that here, because you already have a hole in the ceiling and no way of centring your drill.  You could try to cut an enlarged hole in the plasterboard free hand with a saw - but I certainly don't have the skills to be able to do that in any sort of tidy fashion.

Instead this device is the answer.  It is something called an "oops arbor".  Effectively you use the original (too small) hole saw as the axle around which the new larger hole saw cuts the enlarged hole.  It works brilliantly.  It is going to be well worth the small investment as we have another 9 of these lights and at some stage they are all going to need replacing now that the first one has failed. 

Sorting out this problem has been strangely satisfying - I think I must have hit middle age :-)