Thank you very much!
I have been very busy yesterday but cast some very good bullets. I have to check them to sort the bad ones.
It tooks more than 4-6 seconds for the sprue to solidify and was very dificult to mantain enough lead over it. Lead flows too much and sometimes I get a hole in the spue.
I will try your advise of "set the blocks down on a piece of steel for 3 to 5 seconds".
Thanks
Martin