I recently installed the spacer blocks. Frustrated with the blocks tending to skate around, I elected to shoot them on with 3/4” stainless steel 18 gage brad nails. Worked perfectly. Plenty of pressure to squeeze out glue without over clamping.
Interesting. Thanks for the info. I've always wanted to do spacered inwales. Skipped that on my Passagemaker build because I was in a hurry.
They're readily available on Amazon.