The only knobs I found that will work are apem 4200272B1/4. 9.4mm diameter.
http://www.digikey.com/products/en/hardware-fasteners-accessories/knobs/568?k=&pkeyword=&v=679&pv73=37&pv76=467&FV=ffe00238&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
If I even find them anywhere, maybe from a chinese supplier, the only way to adjust them will be holding from top and bottom since there will hardly be any clearance between them. It is acceptable to have no knobs since the 1/4" alpha is big enough, but not preferable. I could engrave a groove on the shaft as position marker.
I won't be doing any gain riding, so if it's reasonably possible to set gains before a session that works for me, even if it's slightly more difficult than with a proper/larger format.
http://www.digikey.com/products/en/hardware-fasteners-accessories/knobs/568?k=&pkeyword=&v=679&pv73=37&pv76=467&FV=ffe00238&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
If I even find them anywhere, maybe from a chinese supplier, the only way to adjust them will be holding from top and bottom since there will hardly be any clearance between them. It is acceptable to have no knobs since the 1/4" alpha is big enough, but not preferable. I could engrave a groove on the shaft as position marker.
I won't be doing any gain riding, so if it's reasonably possible to set gains before a session that works for me, even if it's slightly more difficult than with a proper/larger format.