I have a sex machine but the dildo you get with it I cannot use due to the material, I am allergic to it. I strictly only use glass dildos because of this reason. I’ve done lots of research online for hours and it was recommended that I get a suction cup adapter and a silicone sleeve to put around the base of the glass dildo in order for it to stick but obviously I know this wouldn’t work as the dildo has weight to it so it would just fall off. I am aware you can get a suction cup adapter with straps though. I recently found a vac u lock vibrator holder online and purchased it but it does not attach to my sex machine as the machine end has 3 holes that needs an attachment with 3 prongs. So after more research, I recently found a vac to 3XLR connector which does plug into my sex machine as it has the 3 prongs on one end that I needed but then the other end has these little nubs inside and the vibrator holder does not connect to it. It fits inside of the connector but doesn’t stay/click into it atall as the connector hole is bigger than the vibrator holder hole. I am about to lose my mind with all of this. What can I buy that will allow the vibrator holder to connect to the attachment I bought? Or even just to the machine? I don’t want to buy a new machine if i can help it as this one is new and I can’t return it now. 

Also is it safe for me to use a glass dildo in a vibrator holder? I read online that it can be a risk having glass clamped. I’m not sure what else I can use though to make this work after lots of research. 

And what is the top part of the vibrator holder for? The top screws off and on.

Sex machine attachment help!