Knackered stalk?
Well I have a new pump for £5 so ill change that first as its easy to do then go from there.
Make sure you have the right pump before taking things off, see the links in this post (or have you bought a 2nd hand one?) It's just that price sounds too cheap for the correct pump which is what happened to me.
I went to euro car parts and got one for £5, got home and it was the wrong pump. They couldn't actually match it up to the sport pump. I went to a different motor factors and the chap there had come accross the part no. problem before, think he said the 172 uses the same washer system as the newer clios. Anyway, ended up,costing me about £18 with trade discount.
Anyone buying one make sure it looks like this one before you take he wipers and scuttle off...
http://www.ebay.co.uk/itm/RENAULT-C...rParts_SM&fits=Model:Clio&hash=item3ccecee017
The one euro car parts have down to fit is this one..
http://www.ebay.co.uk/itm/Renault-C...arts_Vehicles_CarParts_SM&hash=item3a69254864