1950 M20 rigid back wheel adjustment

[DANFINN]

I am struggling trying to work out the drive chain adjustment on this bike. On the nearside I have a snail cam but on the offside I have nothing. Speaking to Kidderminster Motor Cycles, they said I can use a snail cam. But I'm not sure how this can work as there is no lug on the frame to butt up to. On closer inspection I find that the place where a hole should be for an adjuster bolt has not been drilled, so this frame never had one of those, I assume.

Help and guidance would be much appreciated as I would like to get this old machine sorted out. It was an older (botched) restoration I was told

[Dennis49]

Hi, My rigid B31 has snail cams both sides. They fit inside the frame where there is a stud. They are slotted so that they turn together when the wheel spindle is turned. Hope this is of some assistance. Dennis

[sidewaysid]

Dennis49, my 1947 frame is like yours, two small rounds on the inside of the frame onto which the snails work, it's a bit fiddly, but once clamped up works fine.

[GLENN]

There should be a snail cam on 1 side and an adjusting screw on the other.  All the best,   Glenn

[DANFINN]

Thanks folks!

It looks like I should drill the hole, tap it and put an adjuster screw in, looks to be a more stable solution