Trying to find a shop that can bore small bore engines is getting very difficult these days, even in a big city like Melbourne they are few and far between. They have either retired, died or just given up because it just isn't economical to rebuild motors these days, cheaper to just replace
That I can agree with as even here for automobile engine I can't even find a machine shop that can do them.
Anyway the last time I had a small Briggs 12.5 hp done outside my shop, the shop that did it fouled the cylinder so bad that it was junk afterwards and they still wanted their money. That why I brought my own hone to do cylinders but I mainly only do horizontals and none replaceable engines get rebuilt now as you said replacement on so engines are nearly equal in cost.