Welcome to the forum. Assuming you are located in UK, try:-

www.srsmicrosystems.co.uk
www.parkcameras.com
www.mifsuds.co.uk

If you buy from a Pentax Pro Centre you'll get 2 years warranty.

You'll grow old waiting for a genuine Pentax one. AT least if you make one, you'll have one to use whilst you look for the genuine article, but I suspect you wouldn't need to.

Welcome to the forum.

From your location I'd guess it's cold too. Warm batteries will work longer so keep a spare set in an inside pocket when you go out taking photos.

Have a look at these from Leroy Merlin.

No worries, apology accepted. I just wish a had used a decent extension tube set in the first place.

If Carlsberg made reversed reversing ring adapters to fit ring flash lights to reversed lenses, they'd probably do a half decent job. Until then . . .

Hang on a minute mayday. You copied my idea and even posted in my thread, so why not link to my thread on this forum instead of PentaxForums? Your version differs from mine only in the fact that it locks on to the reverse mounted lens. This is a function of the chosen donor extension tube, not the overall design. My mark II version would use a suitable extension tube rather than one that fell to pieces once I'd started dismantling it.

You could at least have the courtesy to acknowledge my thread here, though I appreciate the acknowledgement on the other forum.

That looks interesting Tony.

The K Bayonet end looks OK but what is at the other end, it looks like a bevelled mount for something, possibly a ring flash of some sort.

Does that part unscrew to leave a female threaded part?

Also, it might be Pentax fit, but I doubt Pentax ever used 'sticky' labels to identify their products.

I think you meant to write can't (can not).

See my topic from 2007 here. I think you'll have to make one. If you choose the right donor extension tube, you can even have it locking onto the end of the reversed lens. Mine doesn't but it's never been a problem so far.

I used a larger filter thread than you need. It might be sensible for you to do the same and use step down rings to get to 49mm.

You've posted the same question 3 times now. Your latest post will surely be deleted as it just adds clutter to the forum.

You've asked the question, you've had a perfectly good answer from Ken.

You have less than 10 days now, buying studio flash should be based on a well considered decision, not panic.

I don't think your budget will buy you anything worth having so hire the kit for now, then buy something decent when you have more cash.

Or buy one of these at least. Add a Stofen Omnibounce and you're good to go.

What's the shutter count on the K20D?