I understand how I can reduce to 115mm with a 15mm spacer. Can I add another to go to 100mm? (dual air fork)

IIRC I was informed (probably via here) that you can keep adding all travel spacers, and just keep reducing the travel… it was mentioned in relation to using modern forks (well Reba’s) on older short travel frames (60mm).
Never tried it myself though, maybe drop a mail to Loco and ask a suspension specialist’s point of view.

yes basically – I have done it with recons and rebas so I guess revs will be very similar. Especially as its an air fork so no coil spring to get coil bound.

Top, I have several RS spacers – so it is just a case if measuring their length, I presume they are 15mm long. Stripping fork and clipping 2 on.

All done 100mm sorted.