I had a fixed focus HAWKE 3-10 x 44 Eclipse scope for many years, but it was not much use to me for this MPL competition as it would not focus down to 10 metres - in fact I don't know what distance this pre-set scope was designed to be used at, although it was nice and sharp at longer distances outdoors.
By loosening the front collar I was then able to hold and turn the threaded sleeve that had the front lens fixed inside it. This was quite a slow job as the sleeve seemed to be coated in a very sticky grease that sludged the movement down considerably but it did unwind very slowly and the further outwards it came - the closer the focus became.
I kept winding this threaded sleeve out (hoping it did not fall out as I run out of screw thread) until it looked like it was "somewhere near" and then I took it to the clubs 10 meter range to see if I could get a good sharp focus on the 6 yard target we are shooting at in this 10 meter series.
I managed to get the focus good and sharp on the target so I was able to read all the printed wording and the scoring numbers on the rings, and then I screwed the front collar back on again to lock it in position.
Now I have a nice scope to use at 10 meters that is ideal for this competition and it cost me nothing as it had been laying around unused for years!
I left the scope fitted to my TX200 when Gordon (the ferret juggler) borrowed it to have a shoot with us on our club range last night. As an experienced bench rest shooter he is used to having very good scopes on his rifles so I took a spare with me in case he did not find it to be good enough - but he used the scope all night with no problems, so I am really pleased !
If you have a fixed focus scope laying around (or buy one cheaply) you may like this link that Russ sent to me. It came after I had already done the same thing with mine, but it shows the method much better as the photographs are easy to understand.
http://web.archive.org/web/201111150.../parallax.html
I am really happy with my (non original) experiment and I will be looking out for similar (cheap) fixed focus scopes that could be helpful to others that would like a simple non-adjustable focus scope to use at 10 metres.