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Battery "Frogs" or hold-down clamps for 1940-51 Chief (aluminium) and 741 (iron), note the differences. Not only is the 741 version much flatter, since there is not so much room in the frame, but also the dimple for the hold-down bolt is in a different place. There are 4 pictures here.

The clamps are held down with an adjustable bolt treaded into the bottom of the generator bracket on Chiefs and a lock nut on the bolt, an adjustable bolt and locknut with the bolt going into a threaded hole in the frame on 741, and a slightly more elaborate setup with two bolts on Sport Scouts.

There are two different clamps for Sport Scout; up to 1939 and 1940-42.

Chief up to 1939 used a different system with straps. The clamp in the pix was used for Chiefs 1940-51, with another version for 1952-53.  And an extra-special clamp - made of wood! - was used for the big batteries on Police models.

Sorry, I don't know (and I am not sure I want to) what the Fours and Junior Scouts used :-)

741 happily only ever used the clamp in the pix; almost too easy!

Also in the pic a hollow replica of the ~1940s Indian battery for putting a smaller modern battery inside. DON'T do this unless you have a regulator on your generator/dynamo, or full control over your 3-brush adjustment. If in doubt about the reason for that, ask me.

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