Not sure if this has already been mentioned but i have just found this item.
Quite a while ago there was talk of a mat that would click when the desired pressure was applied to the tamper.
Well i have just found this :
http://www.coffeehit.co.uk/PRD_ProductD ... amping-Mat
Looks as though with this any tamper can be used and click at the correct set poundage.
Eric