Frazer very nice i have bookmarked it and will study it later many thanks
Update so far what i said about a steam platform you will see at the end
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Hopefully you can see what i have been up to the UV joint will be replaced it had been bored out to 3mm where as the shaft this time is 2.3mm and is too wobbly new one on order. Shaft this time is quite short wanted to see how short i could go lengthwise as a result the shaft is light that`s why you will see the spring otherwise it won`t engage properly the gear is just one i picked out the scrap box and may not be the final one. Once the correct gear is found the spring can be adjusted for correct tension the two vertical bolts are there to keep the worm in line with the gear.