Sound like a static stretcher to me, but there’s so many do it yourself versions on here. All I can suggest is to try various searches in order to find it, and when you do, use the thread tools option on the top right of the first post to add it to your favourites.
I would search for “static stretcher”, “extender”, or “make your own” to help you. Hope you find it friend, good luck.
Dec \'23 -> Feb\'24 17.5cm -> 18.5cm BPEL / 12.7cm -> 13.1 MSEG / 18.5cm -> 18.9cm BPFSL (measuring in mm for accuracy)
My First Real Attempt:
2006 Start: 6.25" BPEL and 5" EG - 2012 7.625" BPEL / 4.875" EG / 8.063" BPFSL. (All manual routine)