Apologies for cross-posting:

I've had my 2010 Surly Cross Check stripped and repainted, and I'm slowly putting it back together. When I broke it down, I noticed that the guy who'd installed my SRAM Rival Cranks and GXP Bottom Bracket had put one of the 1.5mm spacers included with the BB on the drive-side cup only (nothing on the non-drive side). I also recall him making an off-hand comment about it being tough to get my chainline set properly (the bike came with old-style splined cranks and internal BB).

The BB shell is, according to Surly, English-threaded and 68mm, meaning no spacers should be necessary per SRAM's instructions that came with the new BB. I've screwed in the BB cups and mocked the cranks up; I don't see any apparent issues.

Did the shop guy know something I don't? Have other folks with Cross-Checks noticed a similar issue? The Surly website is silent about the issue, which tells me the shop guy was off, but who knows?

Just trying to save a bit of time and labor. Thanks!