1951 Phillips 3 speed
 

hello, i have as the title says a 1951 phillips 3 speed. I have an issue with the chain case there is a piece at the back that goes over the rear hub sprocket, this is held on my one screw but will not tighten and keeps falling out. is there someone out there that can help with this i can post photos if needed

Is it a sheet metal screw or a machine screw? If it is a sheet metal screw, one size larger should grab and hold. If it is a machine screw you'll need to re-tap the hole.

I think a '51 would have had a Whitworth threaded bolt and not a screw but I've never had one that age. Maybe someone in the English three-speeds thread could help you?

it is a machine screw, the threads are fine, there is a piece that goes from the upper chain case to the lower there is a u shaped piece that fits between, the machine screw screws in from the back into this piece, i will post pics

Lower section fixed nut
 

The main casing that your corner piece sits on/in should have a nut fixed permanently that the corner piece bolt engages. If one or both are deformed the bolt hole and the fixed nut may be out of alignment. Check if the fixed nut is still Insitu.

Since the threads look good, I'll guess somebody lost the original screws and tried to replace them with screws that were close, but not exactly the correct thread. British threaded screws are next to impossible to find here in the U.S. Might be more available there, but I think I would just re tap and use similar sized modern stainless screws.

i would like to add some pics but it will not let me says i need 10 posts to add urls

all i want to do is add some pics so you can see what i am talking about but guess not so here i sit

this does not help, if this forum will not allow pics then so be it thanks for what ever help you have offered but it was of no help