Butler was in the right place at the right time to tap home and secure his side's path into the last four with a 2-1 victory at Newman Collard.
However, Mark Glazier's side had to do it the hard way, trailing at the interval to the HPFL Division One side.
Second half pressure eventually got its reward with Ralph Anelay heading home the leveller, prior to Butler's winner.
A home draw against either Denmead or Bishops Waltham Dynamos awaits in the semi-final, with the Overton United meeting one of Andover Town or QK Southampton in the other tie.
Debuts for Junior prospects, Charlie Barrow and Harry Wright helped the Reserves to a 2-2 draw at neighbours, Whitehill & Bordon. Tom Kirby and Wilf Marshall on target for the Blues - who also played their final fixture of 2024.
The first team return to League action on January 4 in hosting Stockbridge at Newman Collard Park - keep an eye on our socials for news of Reserve fixtures which are yet to be published at the time of writing.
The Club would like to take the opportunity to thank you for all your support this year, and wish you a very merry Christmas, and a prosperous New Year.