Luke,
It seems you and I are on parallel tracks with the work on our A7s. I am also in the midst of trying to un-sieze my pistons and, before long, will need my timing-side bush replaced.
I thought I had previously asked where you're located, but it seems not. I am in the western suburbs of Chicago and a local automotive machine shop (Custom Engine Service, Aurora, IL, ph: (630) 844-1071) has worked out very well for me.
C.E.S. just did the timing-side bush on my A10. I explained what I wanted, provided the new bush and left him the Haynes manual (doubt that he needed it). As far as I'm concerned they did a top-notch job. He says it's 0.001" clear and I believe it. I told him I thought that the journal needed to be ground, but I was wrong and he told me all it needed was polishing out the high spots of some scratches, thus, foregoing the money. Sooo much better than the last time it was done by a Brit bike specialty shop whom I don't name in open forum (PM me if you want that story).
Now, don't expect to get a receptionist answering the phone, these folks are all shop and no frills except for, apparently, having every kind of machine needed to work on internal combustion engines and wicked skills. (Crank and cam grinding; welded journal buildup, spray metalizing, magnafluxing, balancing, line boring, etc, etc, etc.) Oh, did I mention the price, in my opinion, was quite reasonable? No, I don't own the place or have any relatives working there, but I hope they remain in business as long as I am still working on engines.
Richard L.