How to replace Gromit on 2nd gen Punto on Driver wiper lin..

I have a 2nd generation punto, the plastic gromit (is this the right
word) has come off the drivers wiper connection to the linkage,
stopping the wiper from working. I can click the connection together
but then it will come apart again after using the wipers for any
length of time. Apparently you have to buy the whole linkage , and
with fitting this is coming to about £150. I cant afford this, and I
am loath to anyway because my wipers broke stopped working two years
ago due to the motor going, and I had to shell out then.

Does anybody have any idea of how I could fix this without buying the
whole part. Alternatively I have found the linkage online for about
£60 but I would still need someone to fix it as I wouldn't know how to
replace the whole linkage.