103mm JIS BBs are fairly easily available. I just bought the Tange one from Velo solo for not very many notes with great service and speedy shipping. Shame your LBS did not know where to look.
But yes, a spacer should work, provided that there is then a good amount of thread left to screw on the freewheel. If the freewheel is hanging on by too little thread, you risk knackering the thread.
103mm JIS BBs are fairly easily available. I just bought the Tange one from Velo solo for not very many notes with great service and speedy shipping. Shame your LBS did not know where to look.
But yes, a spacer should work, provided that there is then a good amount of thread left to screw on the freewheel. If the freewheel is hanging on by too little thread, you risk knackering the thread.