how assemble a qualcast electric starting assembly?

Miles Tool & Machinery Centre sell Qualcast spares and have extensive parts diagrams for many Qualcast mowers.

you may well find your specific mower in their list and the parts drawings might give you an idea of where to put your spring.

http://www.mtmc.co.uk/Spare-Parts/Qualcast-Spare-Parts/Qualcast-Cylinder-Lawn-Mower-Spare-Parts__c-p-0-0-240-12733086-12733087.aspx

Good luck...

Peccavi
April 2013