I posted a longer version of this on mechanics forum but I thought I'd ask here as well...

Can I build a 6 speed winner pro freewheel into seven speeds by using narrower spacers used for ultra spaced freewheel and adding a cog? I am starting with two six speed freewheels, one of which is damaged ultra spaced and one is standard spaced

According to another thread on this forum "For 7 speed, the smallest cog is threaded onto a special 6th cog w/ outboard threads. The 7-speed spacer rings would be same as ultra-6 space,


I have 13 and 14 tooth cogs that thread together as described above (from my standard spaced 6 speed freewheel) and spacers I took from the damaged ultra spaced freewheel. Seems like I could build up a 7 speed freewheel using various size cogs from the two freewheels (thinking 13,14,15,17,19,22,24)

Should add that I am using friction shifters.