"The Medway Handyman" wrote in message
...
Page 5 part 60 here;

http://www.dolmar.nl/images/files/tekeningen/HP11.pdf

Spring pressure needs increasing 'very slightly'. Or a new valve.

p.s. Not using Hozelock 'Waterstop' connectors by any chance?



Great explanation .,.. I am away for a few days with work ... will take a
look, maybe a clean will fix :-)
Don't suppose you have same parts list / drawings for the Hobby 88 ?

It is a rectangular box type, rather than upright.