Hello RON L here = SERESURPLUS
I'll ask the Obvious question, are you sure the rod you got was for SKS? Remember the Russians as well as the Chinese Made cleaning rods for the AK, SKS, SVT-40, 91/30 and more? Is your stock a wood factory model or an after market Nylon? All those will effect the fit and feel of where the Cleaning rod is supposed to go?
If yours is the correct ROD Length, and the stock is the Factory Geraric one, No worries, it should slide right down and be held by the underpart of the Bayonette lug!If goes not far enough or too far, it's a mis=march for sure?
PS: Sorry, I can't be of more help, but without seeing it, I can't say a lot? Can you send Digital Pic perhaps we can look and see what the problem might be, the rod in the stock as far to normal as you can slide it?