My linegear pin pusher came in yesterday and I managed to get the nose rivets out, coupler changed and pressed back the rivets. However, having read @rmontez thread about his experience, I still couldn't quite figure out how best to utilise the tips and "base" tools... So, I managed to use Tip A and Base D to push out and press back the rivets but obviously, Tip A would possibly leave a mark on the rivets. Tip B's flat base seem more appropriate and while I can remove Tip A from the fixture, I can't figure out how to swap Tip A with Tip B. Tip A is at least 2.5x the length of B and had a long spring and C clip right at the end. I would like to point out that Linegear's tutorial showed that they used Tip A in all instances. Anyone with the same tool can explain how they manage to use Tip B? It's a no-brainer for bases C and D. The rounded edge of D is less likely to leave a mark on the nose bridge but adding a layer of masking tape is absolutely necessary. One last thing, to my surprise, it's not that difficult to push out or press in the rivets. Done 2 frames last night without any scratches to the nose bridge, only some marks on the back of the rivets.