navman2 - 2 minutes ago »
Picture 1
No picture. The lnb is normally secured with a pull out pin. Once the pin is removed and the f connectors are unscrewed it just pulls off the end of the lnb arm.
Unless the dish is really ancient this one should fit.
These might help
Hi Graham I hope these re-sized pictures are okay to identify my LNB.
Regards,
Barry
IMG_20180108_55415.jpg (96 KB, 0 downloads) 6 years old IMG_20180108_18187.jpg (56.7 KB, 0 downloads) 6 years old IMG_20180108_3355.jpg (75.6 KB, 0 downloads) 6 years old navman2 - 26 minutes ago »
Hi Graham I hope these re-sized pictures are okay to identify my LNB.
Regards,
Barry
Looks like a MK3. The lnb listed when fitted to the legacy adapter should fit. You might want to optimise the alignment slightly which is easy with the help of a friend if you dont get 100% signal and quality on a UK spot beam transponder like say BBC 1 HD. Post if you want instructions. There are 4 adjustments you can make.
Briefly
Focus moving the lnb back and forward in the collar
Azimuth - Direction the dish points
Elevation - The vertical angle of the dish
Skew - twist of the lnb - not critical note the existing lnb angle which is not vertical.
I recommend greasing the f connectors using silicone grease and using lnb boots - Easier than amalgamating tape.
https://www.amazon.co.uk/Servisol-701-143-Silicone-grease-50g/dp/B000L97ZPI
Okay Graham i will order the unit you recommended on Ebay, plus the other bits and pieces. Just to clarify if I can undo the three cables then the unit left on the arm will be superfluous and if damaged when removing won't matter as long as the arm from the dish is okay? Also is there any protocol for which ports the three cables are attached to when I fit the new one?
Thanks again, you have been extremely helpful.
Barry
navman2 - 46 seconds ago »
Okay Graham i will order the unit you recommended on Ebay, plus the other bits and pieces. Just to clarify if I can undo the three cables then the unit left on the arm will be superfluous and if damaged when removing won't matter as long as the arm from the dish is okay? Also is there any protocol for which ports the three cables are attached to when I fit the new one?
Thanks again, you have been extremely helpful.
Barry
The unit is the lnb. Yes it goes in the dustbin, or the greener metals recyling skip at your local waste disposal site 
You can use any of the outputs they are all identical. Just use the ones easiest to tighten the 11mm f connector nuts. Check the coax carefully for any sign of water ingress or corrosion of the screen and centre core. If the f connectors are screw on type you can screw them off and clean up the connectors.
You may need to remove them anyway to fit the boots onto the cable.
Cheers Graham I will let you know how I get on 
Barry
Hello Graham, The unit and silicone arrived promptly and today I exchanged it on the dish. I was able to fit the new unit using the existing bracket, the ones that arrived with the unit were not compatible with the arm I have. Anyway the important news is that all channels back and working (so far)!
Thank you very much for holding my hand through this problem and solution. I would probably have been frightened off an called an engineer had the help provided not been so clear and comprehensive.
Thanks again. Barry
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