The Nailers suffered another agonising defeat at Rushall Olympic on Tuesday night.
Three changes were made following Saturday’s narrow defeat to Blyth Spartans, with Kieran Walker, Colin Marrison and Bruno Holden coming in to the starting 11.
Bruno Holden had the first chance of the game after ten minutes, following a brilliant cross by Aaron Cole from the right hand side.
Holden rose above his marker to head the ball on target, resulting in a comfortable save by the goalkeeper.
The Rics then opened the scoring after 12 minutes through forward Aaron Williams.
Zac Martin beat Cole down the left hand side to run into the box along the by-line. Martin then cut his pass back to the unmarked Williams who slotted the ball home first time inside the near-post.
Belper then lifted the tempo and a good move on the right between Cole and Cotten saw Froggatt turn on the edge of the box to unleash a tidy effort, which fell just wide of the post.
The Nailers then equalised after 26 minutes after a good spell of pressure.
Steve Warne worked his way into the box and found Cotton, who in turn looped a cross in where Holden steered his header past Belford into the top corner.
Ian Ross then produced a moment of class carrying the ball from 35 yards into the penalty area, taking on two.
Ross then opened his body up and curled his effort on target, with Belford drawing equal to his effort.
Rushall soon took the lead again on the 37th minute after sloppy defending by the Nailers.
Jake Heath played a chipped ball over the top where Aaron Williams picked the ball up well. Williams then held off defender Varley and saw his scuffed shot creep into the back of the net, with Martin off his line.
Williams soon had his chance to claim a first half hat-trick.
The dangerous Martin swung his cross in from the left hand side, where Williams was on hand, unmarked, to drive his header across goal, landing just wide of the far post.
Colin Marrison came close to a second equaliser on the stroke of half-time as his curling effort from the left went inches wide of the post.
Both sides had second half chances, as Froggatt and Holden coming close for Belper, and the Rics forcing two goal line clearances from the Nailers.
Jon Froggatt found space inside the penalty area on 57 minutes after Holden played the ball across, but Froggatt drove his shot over the bar.
The final half-hour proved a one-sided game with Belper throwing everything they had at the hosts.
However, with space opening up behind the Nailers, Nathan Rooney was slipped through on goal down the left hand side.
His initial shot was saved well by the on-rushing Martin, and the follow up was cleared off the line by Varley, with ten minutes left of play.
Belper Town: James Martin, Aaron Pride, Bruno Holden, Ian Ross, Matt Varley, Kieran Walker, Aaron Cole (Evan Garnett 75), Steve Warne, Jon Froggatt, Glyn Cotton, Colin Marrison (Regan Edridge 75). Subs: Jordan Nadat, Tom Burgin, Scot Low.