Help..Sump leaking..

[999gsi]

So my shed (2001 Octavia) has had a slight oil leak for ages, dripping from the sump nut, tried to tighten it but to no avail. Today I bought a new nut,fitted it but went straight in rather than screw tight,put old nut back in will only do up finger tight and then just rotates. Now leaking even more...mmm its my only car and I live on my own...can a sump be rethreaded.. if so any one in Norwich able to help ASAP.. Thanks... Phil.

[999gsi]

thanks guys...my shed cost £200 2 1/2 years ago and tbh it just keeps going. thought I was mechanically minded but I've never heard of a helicoil.. ( just googled it) ill give chequered flag a bell tomorrow, as need it fixed asap.. just checked my bowel.. its loosing approx. 10ml of oil an hr.....