maintenance/repair

I wasn't sure if there was a thread about this started or not, so I started a new one.
No doubt many of you collect the original Transformers as well as other newer versions. Many of the G1's I have are in decent shape, but they have loose joints. Does anyone have any suggestions for tightening said joints a bit. Preferably in a non-invasive manner, ie I don't want to try and take them apart unless absolutely necessary.
Along the same lines, what preventative steps do you take to keep your older G1's in tip top shape?
No doubt many of you collect the original Transformers as well as other newer versions. Many of the G1's I have are in decent shape, but they have loose joints. Does anyone have any suggestions for tightening said joints a bit. Preferably in a non-invasive manner, ie I don't want to try and take them apart unless absolutely necessary.
Along the same lines, what preventative steps do you take to keep your older G1's in tip top shape?