SHIM IT
I make a spacer to set in the recess of my Height Mics for small retainers.  I use two .060″ and one .030″ spring shims and I can use it on SB Chevy heads and others with small diameter springs. The A & B105 work for SB Chevy.

Randy Torvinen
Torvinen’s Machine
Menahga, MN
October, 2023