Cheers MVC, looking at your suggestions:
1)NO! (Dont have a welder, not going to learn on this one)
2)Could this be done in conjunction with the rocks/bolts idea?
3)I'm thinking some form of chemical is the way i will go
4)I like this idea, perhaps a mix if different bolts, nuts, washers and bearing balls might help out, at least to prep for chemical treatment by removing the top layer.
Yep I think:
number 2. with rocks/nuts etc is worth a try. I have not tried it myself yet.
Number 3. Works very well from what I have seen but is expensive.
Number 4. with rocks/nuts etc is worth a try. I have not tried it myself yet.
You might be the guinea pig.
Give them a go and let us know the results.
Martin