I recently purchased a penimaster pro with the rod extender and weight hanging combo. The product seems great except that it comes with only one size of a Glans Chamber. I used the largest diaphragm and the issue is that my glans is too large for the glans chamber, as it is made of hard plastic and has a limited diameter. I cannot seem to find any info on their website or searching MOS as to whether there is a large size glans chamber. Does anyone have any information about this? Thanks.