how to insert chase without locks

I recently bought a small tabletop sigwalt on ebay. Seller said it is a 6x9 but I think it’s bigger because I have recently bought a 7x10 chase for it that seems to fit perfectly other than the fact that neither press nor chase bed have any indication on how to insert or lock it in place. If anyone knows what I can do if anything to make this work, please share.

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