Bashley's chances of joining Eastleigh and Salisbury in the Premier Division next season suffered a huge blow at the hands of league leaders Tonbridge Angels.
Having pulled off a shock 2-0 win over the Kent table-toppers two weeks ago, the Foresters found themselves on the end of a stinging 6-0 revenge attack at the Recreation Ground.
Brendon Cass weighed in with a first-half hat-trick and Bash suffered a repeat dose of punishment after the break as Luke Piscina (2) and Tony Dolby (penalty) weighed in.
With three games to go, it leaves Bash seven points adrift of seventh-placed Stamford and three behind Banbury United, who occupy the play-off position of eighth.
The Foresters have a game in hand over both those clubs but face another mammoth task tomorrow away to second-placed King's Lynn (7.45).
Bash boss John Robson reflected: "Tonbridge are a very good side, but we beat them two weeks ago because we were a very good side and did everything right against them. Unfortunately we didn't come out of the dressing room this time and Tonbridge were on top for the whole 90 minutes. They came here to do a job and I've got total respect for them.
"That's our goal difference out of the window. The seven we scored against Fleet on Monday could have been like an extra point to us, but that's gone after letting in six."
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